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(2) CPU Functions
MN18806 Block Diagram
(c) Timer / Counter
.
16bit x 3, 8bit x 8
(f) Pulse Generator for
(d)A/DConverter
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Motor Step
CPU
This block mainly consists of the Program Counter, Arithmetic Logical Unit, and Instruction Decoder. This
block fetches the program from the ROM, decodes the instructions, and processes it accordingly.
Serial Interface
This block supports a serial communication interface (synchronous and asynchronous). This block also
has a baud rate generator of up to 9600 baud.
Timer/Counter
This block consists of two 16-bit timers and four 8-bit timers. They are used for generating the timing for
the printhead and carriage motor.
A/D Converter
In this circuit, 8 bits/4 channel A/D Converters are prepared. One channel is used for sensing the overheat
of the printhead and other channels are used for sensing the input of control panel switches, color module
and color ribbon installation.
Watch Dog Timer
When a program does not run properly, the CPU is reset.
Pulse Generator for Motor Step
In this circuit the pulse generator for the stepper motor is prepared. This function is used for the color
ribbon lift motor. Motor driving pattern is generated automatically when the generator receives the starting
signal. The pattern is synchronized with the output of the timer, which determines motor pulse rate.
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