Furuno FS-1503, Service Manual

Page: 13 / 136

2-6
2.2 CPU
1. General
LCD PANEL
U1: 05S0805
LCD DRIV
U2: HD61602
KEY PAD
LED DRIV
EEROM
U5: X24C16S
Analog signal Detected
Serial data
(converted to parallel data on each PCB.)
Input/output control signal
CR1: Blinking
CPU: U6
HD6475328F10
(H8/532one-time)
or
HD6435328F
(H8/532maskROM)
CPU
ROM
RAM
A/D
I/O
TX/RX DATA
(REMOTE CONT)
DATA, CLK, ST, ENB
S, IA, RF, TEMP,
CHK EXC
Y1 20 MHz
TX/RX DATA
(IA not provided on standard set)
Figure 2-2 Block Diagram of CPU
U6: CPU is a 16-bit single-chip microcomputer with integrated peripheral functions such
as RAM, ROM, timer, serial I/O, A/D converter, and I/O ports. The system program,
ITU frequency table, system settings, initial values of power data, etc. are stored in
the ROM of the CPU. EEROM U5: X24C16S (16 kB) stores set power data, user
channels, system settings, and key settings.
Refer to the next page for the functions of input/output control signals of the CPU.
Note) U6 is soldered to the board.
⋅
HD6475328F10 (H8/532: one-time)
⋅
HD6435328F (H8/532: mask ROM) ----- for permanent use
* Program number: 05501-91-00X
(This number can be confirmed by turning on power while depressing [ENT]
key, and pressing any key.)