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II-4
1.2 Main PCB Block Diagram
Fig. 2-4 shows the block diagram of the main PCB.
Reset Circuit
Program + Font ROM
512 Kbytes
RAM
(2.0 Mbytes)
EEPROM (128 8 bits)
CPU Core
(MC68EC000)
A S I C
Oscillator (15.3MHz)
Address Decoder
DRAM Control
Timer
FIFO
DATA EXTENSION
CDCC Parallel I/O
Soft Support
EEPROM I/O
Engine Control I/O
Motor Driver
To Panel Sensor PCB
BUS
INT
To PC
Fig. 2-4
HL-820/1020