JPH0139140B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field The present invention relates to an electronic device with a printing machine (for example, a desktop calculator with a printing machine), and in particular, an output printout that can confirm that a clear or clear entry operation has been performed. This invention relates to an improvement in electronic equipment with a printing machine configured to print marks on paper.

(2) Conventional technology Conventionally, each time the clear key was pressed, the
Proposed calculators that print a "C" mark, or devices that print a clear "C" mark (for example, Utility Model Publication No. 53-2521) so that it can be confirmed that the clear operation has been performed at the same time as the power switch is turned on. has been done.

(3) Problems with the prior art Especially in the case of desktop calculators with printing machines that are not equipped with a display device, the cleared state cannot be confirmed on the display device, so no change can be seen in the external state of the device. The operator felt anxious and had a tendency to press the clear key many times in succession. Furthermore, even if the configuration is configured so that the clear "C" mark is printed at the same time as the power is turned on, there are many cases where the operator unconsciously presses the clear key many times and this becomes a habit of the operator. Ta. Due to such wasteful continuous operation of the clear key, a clear mark is unnecessarily printed on the paper each time, making it difficult to see the printed results, and the paper is wasted.

(4) Purpose of the Invention The purpose of the present invention is to print a mark based only on the first clear or clear entry operation when a clear or clear entry operation is performed, and to print a mark based on subsequent key operations. An object of the present invention is to provide an electronic device with a printing machine that prevents the above.

(5) Embodiment In FIG. 1, reference numeral 1 denotes a central processing control unit CPU that performs calculations, displays, and outputs printed information. 2
is a key input device KEY which has a numeric key, a calculation instruction key, and especially a clear key C and a clear entry key CE, and receives a key strobe signal from the CPU 1 and a key return signal.
Output to CPU1. Reference numeral 3 denotes a display unit (for example, a liquid crystal display device), which displays a desired character by applying a display signal from the CPU 1.
4 is a print control circuit for controlling the printer 5
PCU, and PCU4 is the 1 that should be printed from CPU1.
It receives character codes for lines and prints them out. FIG. 2 is a block diagram showing details of the inside of the CPU 1 shown in FIG. In the figure, the inside of a CPU 1 is composed of a read-only memory 10 (ROM) as a control section, an instruction decoder 11, a subroutine stack 12, and a program counter 13, and a random access memory as a memory section. Consists of 14 (RAM), AX register 15, and AY register 16, AX and AY registers are RAM
This is a data pointer that specifies 14 files and columns. The arithmetic unit is an arithmetic logic unit 17.
(ALU) has a liquid crystal interface 18, a PCU interface 19, and a key interface 20 as interfaces with the outside, and are connected to the display section 3, print control circuit 4, and key input section 2, respectively.

(Details of the ROM section 10) The ROM section has a built-in program for executing the present invention, and executes various instructions via the instruction decoder 11. Subroutine stack 12 (ST) is a stack required when executing a program. 13 is a counter (PC) for program addresses.

(Details of the RAM unit 14) The RAM 14 stores data, is used for temporary storage during calculations, and is used for flags.
It has seven registers B, C, and D (the third
(see figure). The address of each register is AX
File specification in register 15, AY register 1
6 specifies the digit.

Further, the calculation unit 17 (ALU) executes calculations such as addition, subtraction, multiplication, and division based on the program in the ROM 10. It is also possible to execute conditional jump commands, etc., and various controls can be performed by combining these commands. For example, if the contents of register A are 1(A
=1) is determined by, for example, whether the result of subtracting 1 from the contents of the A register is zero.

FIG. 4 is an example flowchart for explaining the operation of the present invention. First, key discrimination is executed, and when the clear key is pressed for the first time ( _n1 ), the process advances to step _n2 , and since the contents of the A register are A=0 at first, a clear mark "CL" is printed on the paper ( n ₃ ), execute 8→A in the A register at step n ₄ . In this state, if the clear key C or clear entry key CE is pressed successively, the contents of the A register will be A = 8, so the process will proceed to the display routine without printing anything, and when the clear key is pressed repeatedly, Printing can be performed only once for the first time (n ₁ → n ₂ → display routine or n ₁ → n ₅ → n ₆ → display routine). If a key other than clear key C or clear entry key CE is pressed in this state, the process advances to step n ₁ → n ₅ → n ₇ , and at step n ₇ , 0 → A is executed, and A=0, and then the clear key is pressed. Or when the clear entry key is pressed, the clear mark “CL” will appear.
Or the clear entry mark “CE” is printed,
If you do not press these keys consecutively, the clear mark “CL” will always be printed (n ₁ → n ₂ → n ₃ → n ₄
or n ₁ → n ₅ → n ₆ → n ₈ → n ₉ → n ₁₀ ) Furthermore, after operating the clear entry key CE, A=1, and even if the CE key is pressed thereafter, the “CE” symbol will not be printed (n ₁ →n ₅ →n ₆ →n ₈ →display routine). moreover
If the clear key C is pressed immediately after the CE key is operated (A=1), the clear mark "CL" is printed because A=8, and for the subsequent continuous operation of the C key and the CE key, A= 8, so the marks “CL” and “CE” are not printed. In this way, printing of unnecessary clear marks and clear entry marks can be suppressed.

As described above, it goes without saying that the present invention can be applied to various types of electronic devices with printing machines other than desktop calculators.

(6) Effects As is clear from the above explanation, according to the present invention, it is possible to prevent unnecessary printing of these marks due to unnecessary presses of the clear or clear entry key, save printing paper, and remove unnecessary marks. This has advantages such as making it easier to see the printed results and making it easier to check calculations.

[Brief explanation of drawings]

Fig. 1 is a system block diagram of an example of an electronic device with a printing machine according to the present invention, Fig. 2 is a diagram showing the internal configuration of the CPU in the same block diagram, and Fig. 3 is a layout diagram of the RAM in the same block diagram. FIG. 4 is a flowchart for explaining the operation of the system. 1: Central processing unit (CPU), 2: Key input section,
3: Display unit, 4: Print drive control circuit, 5: Printer, C: Clear key, CE: Clear entry key, A to D: Register.

Claims (1)

[Claims] 1. Information input means for inputting information indicating that a clear or clear entry operation has been performed, and information input means related to these operations based on the first clear or clear entry operation from the information input means. printing control circuit means for printing the mark information and prohibiting printing of the mark information based on a subsequent clear or clear entry operation; and print control circuit means for printing the mark information in response to an output from the print control circuit means. An electronic device equipped with a printing machine, characterized in that it is equipped with a printing means for selectively printing.