Table of Contents
Advertisement
2-1. Circuit Description
The CPU-293 board is a main control board.
The following describes the functions for the main IC.
MAIN CPU periphery
IC7 (Main CPU):
Performs control of the whole system (using a 32-bit RISC).
Communication with SW-678 is performed by serial communication between CPUs.
IC5, 6:
Program ROM
IC9 to 12:
Stores execution programs and variables, etc.
IC24, 25:
Stores set values of the unit.
IC28:
Stores special set values.
IC14, 15, 20 to 23: CPU I/O (8-bit 3ch PIO)
IC1:
Chip selector (PLD) made up of an address decoder
DISPLAY periphery
IC107:
Main controller for EL display
IC111:
Switches the address buses of the display controller and CPU
(16-bit multiplexer).
IC120, 121:
Stores image data for the EL display (VRAM).
Others
IC304:
IC for command communication (2ch lines can be transmitted and received)
IC406 to 411:
Controller for the rotary encoder
IC36:
Real-time clock IC (MSU internal clock)
The program ROM of this board uses two 8-bit BUS flash memories to operate the data bus at 16 bits. As
the data bus of the CPU itself is 32 bits, the bus width is used effectively according to the device to raise
the processing speed.
BKP-7934 IMM
Section 2
Service Overview
2-1 (E)
Advertisement
Table of Contents
