Panasonic KX-P1150 User Manual
Page 23
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KX-P1150
(2) CPU Functions
Block Diagram
(b) Timer / Counter
(16bitx2, 8bitx4)
(c) A / D Converter
(d) Watch Dog Timer
(e) I/O PORTS
(a) 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.
(b) 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.
(c) 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.
(d) Watch Dog Timer
When a program does not run properly, the CPU is reset.
(e) I/O PORTS
These ports are used for sensing the input of Paper End, Friction/Tractor, Home switches and driving the
LEDs in the control panel.