JPH07209448A - World clock - Google Patents

Abstract

(57) [Abstract] [Purpose] In the world clock, it is possible to rewrite the region name even with a small memory capacity. [Structure] A clock circuit 20 and a display 41 for displaying a place name and a time in an area indicated by the place name are provided. A ROM 32 having a table of time difference data and place name data and a rewritable memory 34 are provided.
The data of at least one place name is written in the memory 34, and the position corresponding to the written place name data in the table is stored in the memory 34. Clock circuit 20
The time to be measured is corrected by the time difference data and then supplied to the display 41 to display the corrected time. The place name data is retrieved from the table or the memory 34 according to the position stored in the memory 34, and the place name data thus fetched is supplied to the display 41 to display the place name indicated by the place name data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a world clock capable of displaying local time (local standard time) in various parts of the world.

[0002]

2. Description of the Related Art Short-wave broadcasting can be received all over the world. Therefore, if a short-wave receiver has a built-in world clock, it can be used when knowing the local time of the location of the broadcasting station or by timer reception (standby reception). It is convenient for occasions. Alternatively, when a business man who travels overseas and abroad carries a shortwave receiver with a built-in world clock, he can properly listen to local broadcasts and Japanese broadcasts.

As the world clock, for each region having a different time difference, a place name representative of the region is prepared. When the operation key is pressed, for example, "LONDO" is pressed each time the operation key is pressed.
"N", "PARIS", "CAIRO", ...
The prepared place names are displayed in order, for example, "T
When "OKYO" is displayed, when you finish the key operation,
After that, there is a world clock in which this place name "TOKYO" and its local time are displayed.

[0004]

By the way, for the place name as described above, it is necessary to prepare the data indicating the place name in the memory. However, if the place name data is prepared in the ROM, it is desired by the user. There is a case where there is no place name, which may cause trouble.

For example, in Paris, Berlin, Rome, etc.
In both cases, the time difference is 1 hour, but as the place name data, "P
If "ARIS" is prepared, even when the receiver (world clock) is used in Rome, it is necessary to match the place name with "PARIS". In this case, the place name is selected incorrectly and the local time is displayed incorrectly. There is. Also, at the same time as the local time,
When the place name is displayed, "PARIS" is displayed even though it is used in Rome, which is unnatural or inappropriate.

Of course, if a lot of place name data is prepared in the ROM, such troubles can be reduced, but for that purpose, a large capacity ROM is required, which is not preferable. Especially when a one-chip microcomputer is used for control, the capacity of the ROM is limited, so it is impossible to prepare a lot of place name data.

The present invention is intended to solve the above problems.

[0008]

For this reason, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the clock circuit 20 and the display 41 for displaying the place name and the time in the area indicated by the place name. And the time difference data
R with table TDTBL of TMDF and place name data CTYD
An OM 32 and a rewritable memory 34 are provided. Then, at least one place name data is written in the memory 34, and the position WLDP or LCLP corresponding to the place name data written in the table TDTBL is stored in the memory 34, and the time measured by the clock circuit 20 is set as the time difference data. It is corrected by TMDF and then supplied to the display 41 to display the corrected time and the memory 3
According to the position stored in 4, the place name data is taken out from the table TDTBL or the memory 34, and the place name data thus fetched is supplied to the display 41 to display the place name indicated by the place name data. .

[0009]

Function: The data of the place name prepared in the ROM 32 is
The place name is apparently rewritten, and the place name is displayed by the rewritten place name data.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the example shown in FIG. 1, a world clock is integrated with a radio receiver. In the following description, local time: local standard time (local time) of the area that uses this world clock world time: local standard time of another arbitrary area: UTC time (Coordinated Universal Time, so-called Greenwich Mean Time) It is the time difference from.

In FIG. 1, reference numeral 10 denotes a receiving circuit having an antenna input circuit and a speaker. The receiving circuit 10 is constructed in a synthesizer system, and its PL
By changing the frequency division ratio of the variable frequency dividing circuit of L (not shown), it is possible to select the broadcast wave signals of medium-wave broadcasting and short-wave broadcasting.

Reference numeral 20 indicates a clock circuit, and this clock circuit 20 keeps time by, for example, UTC time.

Further, 30 is a microcomputer for system control, 31 is its CPU, 32
Is a ROM in which various processing routines are written, 33
Is a work area RAM, 34 is a memory for storing various data, and these memories 32 to 34 are connected to the CPU 31 through a system bus 39.

In this case, the time difference table TDTBL shown in FIG. 2, for example, is prepared in the ROM 32. The time difference table TDTBL is a correspondence table between the names of representative areas and the time differences in the areas. That is, in the example of FIG. 2, the table TDTBL corresponds to the time difference of every 24 hours.
Data field, and the place name number CNUM of "0" to "23" is assigned to this data field. And CNUM = 0
In each column of ~ 12, time difference data TMDF indicating that the time difference is 0 to +12 hours is prepared, and CNUM =
In each of columns 13 to 23, time difference data TMDF indicating that the time difference is -11 to -1 hour is prepared. Further, in each column of CNUM = 0 to 23, place name data CTYD showing a representative area to which the time difference of the column corresponds is also prepared.

For example, in the column of CNUM = 9, TMDF =
+9, CTYD = TOKYO, but this is the place name number CN
In the area where UM is "9", the time difference (time difference data TMD
F) is "+9 hours" and the corresponding place name (place name data C
TYD) is "TOKYO". The place name that can be displayed by one place name data CTYD is, for example, 6 characters.

A local time pointer indicating which data of the data of the time difference table TDTBL is used for displaying the local time and the world time.
LCLP and World Time WLDP are prepared. In FIG. 2, the pointer WLDP indicates that WLDP = 0 and the data of the place name number CTYNO = 0 is used to display the world time, and the pointer LCLP indicates LCLP = 9 and the local time is displayed. Indicates that the data of place name number CTYNO = 9 is used.

The "region name, etc." shown on the right side of the table TDTBL indicates the region name of the region corresponding to the above data CNUM, TMDF, CTYD for reference, and is not included in the data table TDTBL. Absent.

Further, in the ROM 32, as a part of the processing routine, for example, the routines 100 to 100 shown in FIGS.
140, 200 and 300 are prepared.

The memory 34 is a ROM capable of electrically erasing and writing data, or a RAM backed up by a battery (not shown), that is, the memory 34 is a non-volatile memory. The written data can be held even when the power is turned off.

Then, in the memory 34, as shown in FIG. 3, for example, a place name buffer CTYBUF and a region number buffer CT
A YBUF, a rewrite flag WRTF, and a display flag DSPF are prepared. In this case, the place name buffer CTYBUF is for storing the place name data CTYD after rewriting,
The capacity is one place name data CTYD, that is, six characters. The area number buffer NUMBUF is for storing the area number CNUM of the rewritten place name data CTYD.

Further, the rewriting flag WRTF is a flag indicating whether or not the place name data CTYD has been rewritten. This flag WRTF is set to "1" when any of the place name data CTYD is rewritten. ing. The display flag DSPF is a flag indicating whether the local time or world time is displayed.
The world time is displayed when = "0" and the local time is displayed when DSPF = "1". Note that the above pointer LCLP,
The value of WLDP is also held in the memory 34.

Further, in FIG. 1, 35 is an output port, 36 is an input port, 37 is a key interface circuit, and these circuits 35 to 37 are connected to the CPU 31 through a system bus 39. Then, at the time of tuning in the receiving circuit 10, the frequency dividing ratio is set from the CPU 31 to the variable frequency dividing circuit of the PLL of the receiving circuit through the port 35, and the broadcasting of the target frequency is selected. In addition, the reception circuit 10 outputs a signal in which the reception level of the broadcast wave signal being received is detected, and this detection signal is taken into the CPU 31 through the port 36. Further, various operation keys KTS to K9 are connected to the interface circuit 37. Each of these keys KTS to K9 is composed of a non-lock type push switch.

Reference numeral 41 denotes a display for digitally displaying the reception frequency, time and the like, which is an LCD in this example. Then, for example, as shown in FIG. 7, the display area of the LCD 41 is divided into three display areas 41A to 41C, and at the time of time display, a place name based on the place name data CTYD is displayed in the area 41A and an area 41B is displayed. Area 41 is displayed, such as time difference
World time or local time is displayed in C.

The LCD 41 is connected to the system bus 39 through the display controller 42 and the display memory 43 is connected to the controller 42. Then, the display data written in the memory 43 is repeatedly read by the controller 42 at a predetermined cycle and supplied to the LCD 41.
In 1, the time and the reception frequency corresponding to the display data written in the memory 43 are digitally displayed.

In this example, when the power switch (not shown) is off, the power of the receiving circuit 10 is turned off, the time is displayed on the LCD 41, and when the power switch is on, the receiving circuit 10 is turned on. The power is turned on, the broadcast is received, and the received frequency is displayed on the LCD 41.

In such a configuration, each processing or operation is performed as follows, for example.

<Display operation of local time or world time> Here, when no keys are operated,
The time display operation will be described. That is, when there is no key input, the clock circuit 20 causes the CPU 31 to
Interrupted every minute, and when interrupted, CP
The processing of U31 starts from step 101 of the routine 100, and then in step 102, the display processing routine 300 is executed.

Although details of the display processing routine 300 will be described later, in this routine 300, the place name data CTYD of the target area is stored in the time difference table TDTBL or the memory 34 according to each data stored in the memory 34. The place name buffer CTYBUF is read out, and the read place name data CTYD is converted into display data and then supplied to the controller 42 and written in the memory 43.

Further, step 102 (routine 30
In 0), the UTC time data measured by the clock circuit 20 is extracted, and the extracted time data corresponds to the target local time or world time according to each data stored in the memory 34. The time data is corrected, and the corrected time data is converted into display data and then supplied to the controller 42 and written in the memory 43.

After that, the processing of the CPU 31 proceeds to step 103, and this routine 100 ends.

Therefore, in the LCD 41, for example, FIG.
As shown in A or B, the place name according to each data of the memory 34 and the local time or world time in the area of the place name are digitally displayed.

<Switching between local time display and world time display> This is a case where the time display of the LCD 41 is changed from the local time to the world time, or conversely from the world time to the local time.

In this case, the display switching key KWT of the operation keys KTS to K9 is pressed while the above-mentioned <display operation of local time or world time> is being performed. Then, the processing of the CPU 31 starts from step 111 of the routine 110, then in step 112, the display flag DSPF of the memory 34 is inverted, and thereafter,
In step 113, the display processing routine 300 is executed, and in step 114, the routine 110 ends.

Therefore, each time the key KWT is pressed, the display flag DSPF is alternately changed to "0" or "1", and the routine 300 is executed in accordance with the result, so that each time the key KWT is pressed. The time displayed on the LCD 41 alternates between the local time and the world time, as shown in FIGS. 7A and 7B, for example.

<Switching of Local Time Displayed> This is to change the local time displayed on the LCD 41 and its place name to the data order of the time difference table TDTBL or its reverse order, and to change the displayed local time and its place name. This is a case of switching to the local time and the place name of an arbitrary area.

While pressing the time setting key KTS among the operation keys KTS to K9, the up key KUP
Alternatively, the down key KDWN is pressed. That is, if the key KUP or KDWN is pressed while pressing the time setting key KTS, the processing of the CPU 31 is executed by the routine 120.
Starting from step 121, then step 122
In step 123, DSPF is changed to "1" (display of local time), and then in step 123, the local time pointer LCLP is incremented or decremented by "1" corresponding to the operated key KUP or KDWN. .

Then, the process proceeds to step 124, in which the routine 300 is executed, and in step 125, the routine 12 is executed.
0 ends.

Therefore, if the key KUP or KDWN is pressed once while pressing the time set key KTS, the LCD 4
The display of 1 is switched to the local time and its place name regardless of the display until then, and the local time and its place name are changed to the local time and place name of the next or previous region in the time difference table TDTBL.

Further, if the key KUP or KDWN is pressed while pressing the time set key KTS, the processing of the routine 120 is repeated, so that the place name displayed on the LCD 41 and the local time of the place of the place name are displayed in the time difference table. According to the place name data CTYD of TDTBL and the time difference data TMDF, it is changed in the ascending direction or the descending direction.

Therefore, by pressing the key KUP or KDWN while pressing the time set key KTS, the place name prepared in the time difference table TDTBL and the local time in the area of the place name can be selected and displayed on the LCD 41. .

<Switching of World Time Displayed> This is to change the world time displayed on the LCD 41 and its place name to the data order of the time difference table TDTBL or its reverse order, and to change the displayed world time and its place name. This is the case of switching to the world time and the place name of an arbitrary area.

In this case, first, if necessary, the display switching key KWT is pressed to execute the <switching between local time display and world time display> to change the time display of the LCD 41 to the world display. Set the time and the place name, and then press the key KUP or KDWN. Then, the processing of the CPU 31 is step 1 of the routine 130.
In step 132, starting from 31, the world time pointer WLDP is incremented or decremented by "1" in response to the operated key KUP or KDWN.

Subsequently, the process proceeds to step 133, in which the routine 300 is executed,
Then, in step 134, this routine 130
To finish.

Therefore, when the world time and its place name are displayed, if the key KUP or KDWN is pressed once, the LCD 41 displays the next time in the time difference table TDTBL from the world time and its place name that have been displayed up to that point. Or it is changed to the world time and the place name of the previous area.

Further, the key KUP or KDWN
When is pressed, the processing of routine 130 is repeated.
The place name and world time of the place name displayed on the LCD 41 are changed in the ascending direction or the descending direction according to the place name data CTYD and the time difference data TMDF of the time difference table TDTBL.

Therefore, by pressing the key KUP or KDWN, the place name prepared in the time difference table TDTBL and the world time in the area of the place name can be selected and displayed on the LCD 41.

<Correction of time (clock adjustment)> This is the time adjustment of the clock circuit 41. The operation keys KTS to K9
Of these, while pressing the time setting key KTS, press the plus key K + or the minus key K-.

That is, in this case, first, if necessary, the display switching key KWT is pressed to execute the <switching between local time display and world time display> to change the time display of the LCD 41 to the local mode. Set the time and the place name, then hold down the key KTS and press the key K +
Or press K-. Then, the processing of the CPU 31 starts from step 141 of the routine 140, and in the following step 142, the UT which the clock circuit 20 is counting.
The C time is incremented or decremented by 1 minute corresponding to the key K + or K-.

Subsequently, the process proceeds to step 143, in which the routine 300 is executed, and then in step 144, the routine 1 is executed.
40 ends.

Therefore, by pressing the key K + or K- while pressing the time set key KTS, the UTC time can be corrected, that is, the time measured by the clock circuit 20 can be corrected. .

<Rewriting of place name data CTYD> This is L
In order to change the place name displayed in the area 41A of the CD 41 to the place name input by the user, the place name data CT
This is the process when rewriting YD, and rewriting routine 2
00 is executed.

That is, in this case, first, the above-mentioned <switching between local time display and world time display> is executed to set the time display of the LCD 41 to the world time and its place name, and then Execute <Display World Time Switching> to display area 41A of LCD 41.
Displays the place name to be rewritten. For example,
If the display of "TOKYO" is changed to "JAPAN", "TOKYO" is displayed at the world time.

At this time, the world time pointer WLDP of the memory 34 indicates the place name number CNUM in the time difference table TDTBL in which the place name data CTYD to be rewritten is stored.
Is shown. That is, as described above, when "TOKYO" is displayed at the world time, WLDP = 9 (= CN
UM).

Then, after the above-mentioned preparation state, the edit key KEDT among the operation keys KTS to K9 is pressed. Then C
The processing of the PU 31 starts from step 201 of the rewriting routine 200, and then at step 202,
The input processing of the rewritten place name is executed. The method of inputting the place name itself is not the gist of the present invention, so details thereof will be omitted. Among the keys KTS to K9, the numeric keys K0 to
K9 operates as an alphabet (including numbers, symbols, and blanks) input key, and keys KUP and KDWN operate as a digit position movement key (a key for specifying a character position to be rewritten).

For example, when rewriting the first digit, the key K0
When is pressed, the character “A” is displayed in the first digit of LCD 41A, and thereafter, each time the key K0 is pressed, the display changes to
"B" → "C" → "0" → "A" → "B" → "C" → ...
As described above, the characters “A, B, C, 0” are cyclically changed. Further, when the key K1 is pressed, the character "D" is displayed in the first digit of the LCD 41A, and thereafter, every time the key K1 is pressed, the display is "E" → "F" → "1" →
The characters "D, E," like "D" → "E" → "F" → ...
It changes cyclically between F and 1 ”.

Then, when the desired character is displayed,
When you press the key KUP or KDWN, the character at the digit position that has been the target of rewriting is confirmed, and
The digit position to be rewritten changes to the left or right. Further, for this rewriting, the RAM 33 is used as a work area, and the character data being rewritten, that is, the place name data CTYD is held in the RAM 33.

In this way, when the target place name is input up to the last character, the place name is displayed in the area 41A of the LCD 41, and the rewritten new place name data CTYD is held in the RAM 33.

Then, when the desired place name is input up to the last character, the execution key KEXE among the operation keys KTS to K9 is executed.
Press.

Then, the process proceeds from step 202 to step 211, and in this step 211, the RAM
The place name data CTYD held in 33 is transferred to the place name buffer CTYBUF in the memory 34, and then step 212
At this time, in the time difference table TDTBL, the place name number CNUM indicated by the world time pointer WLDP is stored as the place name number buffer NUMBUF. For example, as described above, when "TOKYO" is displayed at the world time and the place name is changed, WLDP = 9 (= CNUM), so NUMBUF = 9 (= WLDP).

Subsequently, the process proceeds to step 213, and in this step 213, it is stored that the rewriting flag WRTF is set to "1" and the place name data CTYD is rewritten, and then this routine 200 is executed at step 214. finish.

Therefore, according to this routine 200, when the place name is rewritten, the place name data CTYD of the new place name after the rewriting is stored in the place name buffer CTYB of the memory 34.
The place name number CNUM stored in the UF and corresponding to the rewritten place name data is stored in the place name number buffer NUMBUF.
Memorized in. Further, the rewrite flag WRTF is also set.

Thus, according to the rewriting routine 200, of the place name data CTYD of the time difference table TDTBL,
Any one place name data can be rewritten to any place name data.

<Processing Content of Display Processing Routine 300> In this routine 300, as described above, according to each data stored in the memory 34, the place name data CTYD of the target area is stored in the time difference table TDTBL or the memory 3.
4 is read from the place name buffer CTYBUF, the read place name data CTYD is converted into display data, which is supplied to the controller 42 and written in the memory 43.

The routine 300 is as follows. That is, in the routine 300, C
The processing of the PU 31 starts from step 301, then in step 302, the rewriting flag WRTF is checked, and when WRTF = "0", the place name data CTYD has not been rewritten, so the processing proceeds from step 302 to step 311. .

Then, in this step 311, the place name data CTYD is read from the column indicated by the pointer WLDP or LCLP in the time difference table TDTBL. That is, when the display flag DSPF is “0” (when displaying the world time), the place name number CNUM (CNUM = WLD) indicated by the world time pointer WLDP in the time difference table TDTBL.
The place name data CTYD is read from the column (P). Also,
When the display flag DSPF is "1" (when displaying the local time), the place name data CTYD is read from the place name number CNUM (CNUM = LCLP) column indicated by the local time pointer LCLP in the time difference table TDTBL.

Subsequently, the process proceeds to step 331, and in this step 331, the read place name data CTYD is converted into the display data, and then the controller 4
2 and is written in the memory 43. Therefore, thereafter, the place name based on the read place name data CTYD is displayed in the area 41A of the LCD 41.

Next, the process proceeds to step 332, and in step 332, when the display flag DSPF is "0" (when displaying the world time), the place name number indicated by the world time pointer WLDP in the time difference table TDTBL. When the time difference data TMDF is read from the CNUM (CNUM = WLDP) column and the display flag DSPF is "1" (when the local time is displayed), the place name number indicated by the local time pointer LCLP in the time difference table TDTBL CNUM (CN
The time difference data TMDF is read from the column of (UM = LCLP).

Subsequently, the process proceeds to step 333, in which the time data indicating the UTC time is taken out from the clock circuit 20, and then step 334.
In step 3, the time data of the UTC time extracted in step 333 is corrected to the time data of the world time or the local time by the time difference data TMDF read in step 332. Then, in step 335, the corrected time data is converted into display data and then supplied to the controller 42 and written in the memory 43. Therefore, after that, the area 4 of the LCD 41
In 1C, the time taken out in step 333 and corrected in time difference in step 334 is digitally displayed.

Then, the process proceeds to step 336 to end the routine 300.

On the other hand, when the rewrite flag WRTF is "1" in step 302, the place name data CTYD has been rewritten, so the process proceeds from step 302 to step 321.

Then, in step 321, the display flag DSPF is checked, and when DSPF = "0", the process proceeds from step 321 to step 322.
In this step 322, the world time pointer WL
The relation between DP and place name buffer NUMBUF is checked, and WLDP
If ≠ NUMBUF, the rewritten place name data CTYD is not the display target, so the process proceeds from step 322 to step 311.

Therefore, thereafter, steps 311 to 33
Since 6 is executed, as described above, the time difference table TDTB
The place name based on the place name data CTYD read from L is displayed in the area 41A of the LCD 41 as the place name of the world time, and the world time is digitally displayed in the area 41C of the LCD 41.

However, in step 322, WLDP =
In the case of NUMBUF, since the area of the rewritten place name data CTYD is the display target, the process proceeds from step 322 to step 323, and in this step 323, the place name data CTYD written here is read from the place name buffer CTYBUF. Then, the process proceeds to step 331.

Therefore, in step 331, the place name based on the place name data CTYD read from the place name buffer CTYBUF in step 323 is displayed in the area 41A of the LCD 41 as the place name of the world time, and
The world time is digitally displayed in the area 41C of the LCD 41.

Further, in step 321, DSPF =
When "1", the process proceeds from step 321 to step 324. In this step 324, the relationship between the local time pointer LCLP and the place name buffer NUMBUF is checked, and when LCLP ≠ NUMBUF, the rewritten place name data CTYD is displayed. Since it is not the target of, the process proceeds from step 322 to step 311.

Therefore, as described above, the time difference table
Place name by place name data CTYD read from TDTBL
Area 41A of LCD 41 as a place name at the local time
And the local time is digitally displayed in the area 41C of the LCD 41.

However, in step 324, LCLP =
In the case of NUMBUF, since the area of the rewritten place name data CTYD is the display target, the process proceeds from step 324 to step 324, and in this step 324, the place name data CTYD written here is read from the place name buffer CTYBUF. Then, the process proceeds to step 331.

Therefore, in step 331, the place name based on the place name data CTYD read from the place name buffer CTYBUF in step 323 is displayed on the area 41A of the LCD 41 as the place name at the local time, and
The local time is digitally displayed in the area 41C of the LCD 41.

Thus, according to the display processing routine 300, any place name other than the place names stored in the ROM 32 can be freely used by using the place name data CTYD stored in the place name buffer CTYBUF of the memory 34. Can be displayed.

Further, for example, place name data CTYD with CNUM = 9
When "TOKYO" is changed to "JAPAN", the place name data CTYD "JAPAN" is stored in the place name buffer CTYBUF. Next, for example, the place name data CTYD of CNUM = 1 "C.EURO" is stored. To "PARIS"
If you change to "PARIS" place name data CTYD
Is overwritten in the place name buffer CTYBUF, so CNUM = 9
When the place name is displayed using the place name data CTYD, "TOKYO" is displayed as the place name. Therefore, even if the place name data CTYDT is rewritten frequently, the relationship between the time difference data TMDF and the place name will not be confused or random.

<< Other Example >> In the above example, one place name among the place names of the place name data CTYD prepared in the time difference table TDTBL is commonly changed to the place name of world time and the place name of local time. If it can be displayed by
In the following example, the place name can be changed and displayed one place each when displaying the world time and when displaying the local time.

Therefore, as shown in FIG.
Includes the place name number buffer NUMBUF and the place name buffer CTYBUF.
In addition, a second place name number buffer NUMBUF2 and a place name buffer CTYBUF2 are prepared. Further, the rewriting routine 200 is configured, for example, as shown in FIG. 9, and steps 203, 221, 22 are different from the routine 200 of FIG.
2 is added. Further, the display processing routine 300
For example, the routine 3 shown in FIG.
Step 325 is added to 00.

Then, these routines 200 and 300
Is executed by the CPU 31 as follows.

<Rewriting of Place Name Data CTYD> In this case, first, <Switching between local time display and world time display> is executed to display the time display on the LCD 41 to either world time or local time. C, and then execute <Switch World Time Displayed> or <Switch Local Time Displayed> to execute LC
The place name to be rewritten is displayed in the area 41A of D41.

Then, when the above-mentioned preparation state is set, the edit key KEDT is pressed. Then, the processing of the CPU 31 starts from step 201 of the rewriting routine 200, proceeds to step 203 after step 202, and checks the display flag DSPF in this step 203 to determine whether the time display is the world time or the local time. It is checked whether it is time, and when DSPF = "0" (display of world time), the process proceeds from step 203 to step 211.

Therefore, when the world time and its place name are displayed, the place name data CTYD of the new place name after rewriting is stored in the place name buffer CTYBUF of the memory 34, and the rewritten place name data is stored. The corresponding place name number CNUM is stored in the place name number buffer NUMBUF. Further, the rewrite flag WRTF is also set.

On the other hand, in step 203, DSPF =
If it is “1” (display of local time), the process proceeds from step 203 to step 221. Then, in this step 221, the place name data CTYD held in the RAM 33 is converted into the second place name buffer CTYB in the memory 34.
Then, in step 222, the place name number CNUM indicated by the local time pointer LCLP of the memory 34 in the time difference table TDTBL is stored as the second place name number buffer NUMBUF2 of the memory 34 in step 222. It

Subsequently, the process proceeds to step 213, and in this step 213, the fact that the rewriting flag WRTF is set to "1" and the rewriting of the place name data CTYD is stored, and then this routine 200 is executed at step 214. finish.

Therefore, when the local time and the place name are displayed, the place name data CTYD of the new place name after rewriting is stored in the second place name buffer CTYBUF of the memory 34.
The place name number CNUM stored in 2 and corresponding to the rewritten place name data is stored in the second place name number buffer.
Stored in NUMBUF. Further, the rewrite flag WRTF is also set.

Thus, according to the rewriting routine 200, of the place name data CTYD of the time difference table TDTBL,
The place name data of the place name at the time of displaying the world time and the place name data of the place name at the time of displaying the local time can be rewritten to the place name data of any place name.

<Processing Content of Display Processing Routine 300> In the display processing routine 300 of FIG. 10 as well, similar to the display processing routine 300 of FIG. 6, the display of the place name where the place name data CTYD is not rewritten and the time of the region is displayed. If so, the process proceeds from step 302 to step 311.
Proceed to, by the place name data CTYD of the time difference table TDTBL,
The display of the place name is executed.

If the world time is displayed, the process proceeds from step 321 to step 322.
In this step 322, when LCLP ≠ NUMBUF2, the rewritten place name data CTYD is not the display target, so the process proceeds from step 322 to step 311.

However, when WLDP = NUMBUF, the rewritten place name and the world time of the region are the objects to be displayed, and therefore the processing is from step 322 to step 323.
To the place name buffer CTYD of world time
It is read from CTYBUF, and then the process is step 331.
Proceed to. Therefore, the place name based on the place name data CTYD read from the place name buffer CTYBUF is displayed in the area 41A of the LCD 41 as the place name of the world time, and the world time is digitally displayed in the area 41C of the LCD 41.

Further, when the local time is displayed, the process proceeds from step 321 to step 324. In this step 324, the relationship between the local time pointer LCLP and the second place name buffer NUMBUF2 is checked, When LCLP ≠ NUMBUF2, the rewritten place name data CTYD is not the display target, so the process proceeds from step 324 to step 311.

However, in step 324, LCLP =
In the case of NUMBUF2, since the rewritten place name and the local time of the area are targets for display, the process proceeds from step 324 to step 325. Then, in this step 325, the place name data CTYD written therein is read from the second place name buffer CTYBUF2, and then the process proceeds to step 331.

Therefore, in step 331, the place name based on the place name data CTYD read from the place name buffer CTYBUF2 in step 325 is displayed in the area 41A of the LCD 41 as the place name of the local time, and the local time is displayed in the area 41C of the LCD 41. Is displayed digitally.

Thus, according to the display processing routine 300, even if the place names other than the place names stored in the ROM 32 are displayed in the world time and the local time, the place name buffer CTYBUF of the memory 34 is displayed. , CT
By using the place name data CTYD, CTYD stored in YBUF2, it is possible to display freely.

[0098]

According to the present invention, in addition to the place name data CTYD of the time difference table TDTBL of the ROM 32, the memory 34 is prepared and the place name data CTYD stored in this memory 34 is also used to display the place name. Place name data in memory 34
By rewriting CTYD, you can display any place name.

Further, it is not necessary to use a large capacity ROM 32 or memory 34, and the microcomputer 30
As a result, there is no problem even when using a one-chip microcomputer.

Further, since the default place name data CTYD is prepared in the ROM 32, the place name data CTYD can be returned to the place name data CTYD in the ROM 32 even if the place name data CTYD is frequently rewritten, and the relationship between the time difference data TMDF and the place name is shown. There is no randomness.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

FIG. 2 is a diagram showing an example of a data table.

FIG. 3 is a diagram showing an example of contents of a memory.

FIG. 4 is a flowchart showing each example of a processing routine using a display routine.

FIG. 5 is a flowchart showing an example of a rewriting routine.

FIG. 6 is a flowchart showing an example of a display routine.

FIG. 7 is a diagram showing a display example.

FIG. 8 is a diagram showing another example of the contents of the memory.

FIG. 9 is a flowchart showing another example of the rewriting routine.

FIG. 10 is a flowchart showing another example of the display routine.

[Explanation of symbols]

 10 receiving circuit 20 clock circuit 30 microcomputer 31 CPU 32 ROM 34 memory 37 key interface circuit 41 LCD 42 display controller 200 rewriting routine 300 display processing routine KTS to K9 operation keys

Claims (1)

[Claims] 1. A clock circuit, a display for displaying a place name and a time in the area indicated by the place name, a ROM having a table of time difference data and the place name data, and a rewritable memory. Data of one place name is written in the memory, the position corresponding to the place name data written in the table is stored in the memory, and the time measured by the clock circuit is corrected by the time difference data. The data of the place name is supplied from the table or the memory according to the position stored in the memory and supplied to the display to display the corrected time, and the extracted place name data is supplied to the display. And the world clock that displayed the place name indicated by the data of that place name