Related Signals Of Cpu Diagram (Figure A3.2.1); A3.2 M17 Circuit Diagram; A3.2.1 M17 Circuit Diagram - Oki OF5600 Service Manual

A3.2 M17 Circuit Diagram

A3.2.1 M17 Circuit Diagram

1. Block diagram
The circuit diagram consists of a CPU, crystal oscillator circuit and reset signal generator.
Figure A3.2.1 shows the block diagram of CPU and the peripheral circuits.
2. Function
1) Crystal oscillator circuit
X1 is a 20 MHz crystal ocillator. The output wave is fed to the CPU through pins
73 and 74.
CLK (20MHz) signal output from pin 71 is used as the system clock and output to
IC2
(IOGA3: input/output gate array) IC20 (IEXCEED) and CTR board.
2) CPU
CPU controls the following functions in addition to the basic processor.
• Scanning control
• Picture processing control
• Printing control
• Serial communication interface (SCI)
• DMA (direct memory access) control
• Interrupt procedure control
• A/D converter
• Programmable pattern control
• 16 bit integrated timer pulse unit (ITU)
• Timing pattern control (TPC)

Related Signals of CPU Diagram (Figure A3.2.1)

Initial Reset Circuit
+5 V
Board Descriptions
CPU
Address bus
Port C
IC1
RES
POWRDY-N
X1
XTAL
20 MHz
EXTAL CK
A - 20 OF 5300/5600 Serv Man, P/N 59278301
Data/Address bus
Port A
Port B
CK (20 MHz)