JPH04307264A - printer device - Google Patents

Abstract

PURPOSE:To easily alter the weighting data of printing data even when a printer is put on the market. CONSTITUTION:An RAM 9 having the table of the weighing data of printing data is prepared and the weighing data of the printing data is written in the RAM 9 through a memory control circuit by the command from a CPU 2. The weighing data is read corresponding to the printing data at the time of printing by a heat control circuit 4 and sent to a thermal head 6 along with the printing data to perform printing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device, and particularly to an RA as a storage means for weighting information of print data.
The present invention relates to a printer device using M.

0002

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional printer device. In the figure, reference numeral 1 indicates a mechanical drive circuit for transporting printer paper and ink sheets, and 2 indicates a central processing unit (CP) interconnected with this mechanical drive circuit 1.
U), 3 is a control ROM that is connected to the CPU 2 and contains a program for the CPU, 4 is a thermal control circuit that is connected to the CPU 2 and thermally controls the thermal head based on the supplied printing data, etc., and 5 is a thermal control circuit. a ROM connected to the control circuit 4 and fixedly having a table in which weighting information of print data, for example, information regarding pulse trains and pulse widths is recorded;
6 is a thermal head connected to the thermal control circuit 4. Figure 5 shows the I/O map of CPU2, and the area related to the upper memory, 0200H to 8000H, is C
It is allocated to a RAM (not shown) provided within the PU2.

Next, the operation of the conventional printer shown in FIG. 4 will be explained. First, the mechanical drive circuit 1 and the thermal control circuit 4 are synchronized under the control of the CPU 2. When the thermal control circuit 4 is supplied with print data, the thermal control circuit 4 stores weighting information corresponding to the printing data, that is, pulse train and pulse width information, in the ROM 5.
Read more. Thermal control circuit 4 supplies printing data and weighting information to thermal head 6, and thermal head 6 performs printing based on this printing data and weighting information. During this printing, the thermal control circuit 4 detects the temperature of the thermal head 6 and changes the pulse train or pulse width of the driving pulses. For example, when the temperature of the thermal head 6 is low, the thermal control circuit 4 supplies a wide pulse or a large number of pulses to the thermal head 6 to raise its temperature, and conversely, when the temperature of the thermal head 6 is high, it supplies a narrow pulse to the thermal head 6. A pulse or a small number of pulses are supplied to the thermal head 6 to lower its temperature.

0004

[Problems to be Solved by the Invention] As described above, conventional printer devices use a ROM as a memory for storing weighting information of printing data, so the setting values of the pulse train and pulse width, which are the weighting information, are There is a problem in that the weighting information is fixed, and therefore, once the printer device is shipped, it is no longer possible to change the weighting information on the market or on the user side. This invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a printer device that allows the market or the user to easily change the weighting information of print data even after the printer device is shipped. With the goal.

[0005]

[Means for Solving the Problems] A printer device according to the present invention includes: thermal control means for thermally controlling a thermal head based on printing data and weighting information of the printing data; and a RAM having a table of the weighting information. , and control means for writing and reading the weighting information into and from the RAM.

[0006]

[Operation] In this invention, RA is applied to the heat control means.
M is provided, and weighting information of print data is written into and read from this RAM by a control means.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention,
1 to 4 and 6 are the same as described above. 7 is a timing generator connected to the CPU 2 and generates a timing signal; 8 is a memory control circuit connected to the timing generator 7 and generates an address signal; 9 is connected to the timing generator 7 and the memory control circuit 8, and controls the printing data. For example, a 64K byte RA that has a table recording weighting information such as pulse train and pulse width information.
It is M. Note that the CPU 2, timing generator 7, and memory control circuit 8 constitute a control means. FIG. 2 shows an example of an I/O map provided in the timing generator 7, and addresses 0000H to 0199H are I/O maps.
The counter preset address of the upper address counter, which will be described later, is assigned to address 0200H, for example, 1 byte, and the counter preset address of the lower address counter, which will be described later, is assigned, for example, 1 byte, to address 0201H, and 0202H. For example, a 1-byte memory logical address, that is, an address of the RAM 9 as seen from the CPU 2 side is assigned to the address. Also, 0203H~
Address 7999H is undefined, 8000H to FFFF
Information in ROM3 is assigned to address H. FIG. 3 is a configuration diagram showing a specific example of the memory control circuit 8. As shown in FIG. The memory control circuit 8 consists of an upper address counter 81 and a lower address counter 82. When address 0200H is specified, an upper address counter initial value preset signal is supplied to the LOAD terminal of the upper address counter 81,
When the 1H address is specified, the lower address counter initial value preset signal is supplied to the LOAD terminal of the lower address counter 82, and when the 0202H address is specified, the memory (
RAM) selection signal is supplied to the T terminal of the lower address counter 82. Also, D of address counters 81 and 82
Address data for initial setting is supplied to the ATA terminal.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained with reference to FIGS. 2 and 3. C
For example, when address 0200H is specified by a command from the PU 2, the upper address counter initial value preset signal is sent from the timing generator 7 to the L of the upper address counter 81.
The upper address counter 81 is selected by being supplied to the OAD terminal, and address data for initial setting is set. Next, when address 0201H is specified, a lower address counter initial value preset signal is supplied from the timing generator 7 to the LOAD terminal of the lower address counter 82, the lower address counter 82 is selected, and address data for initialization is set. Ru. Next, when address 0202H is specified, a memory (RAM) selection signal is supplied to the T terminal of the lower address counter 82, and the address counter 81
and 82 are incremented, and the address of RAM 9 is determined. Then, at this determined address position, C
The weighting information from PU2 is sent to timing generator 7.
written through. The weighting information written in the RAM 9 is read out from the thermal control circuit 4 in correspondence with print data at the time of printing, and is supplied to the thermal head 6 together with the print data to perform printing.

[0009]

As described above, according to the present invention, a thermal control means for thermally controlling a thermal head based on print data and weighting information of the print data, a RAM having a table of the weighting information, and a Since it is equipped with a control means for writing and reading out the above-mentioned weighting information in the RAM, the weighting information of print data can be easily changed by the market or the user. This has the effect of providing a printer device that can control a certain RAM with a small number of ports (3 bytes).

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an I/O map according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing essential parts of the invention.

FIG. 4 is a configuration diagram showing a conventional printer device.

FIG. 5 is a diagram showing a conventional I/O map.

[Explanation of symbols]

2 Central processing unit (CPU) 4 Thermal control circuit 6 Thermal head 7 Timing generator 8 Memory control circuit 9 RAM

Claims (1)

[Claims] 1. A thermal control means for thermally controlling a thermal head based on print data and weighting information of the print data, a RAM having a table of the weighting information, and writing the weighting information into the RAM, 1. A printer device comprising: a control means for reading data.