C-Cpu Board (05P0729); Cpu; Memory; Led - Furuno FS-1570 Service Manual

5.7.1 C-CPU Board (05P0729)

1. CPU

32 bit Main CPU and 8 bit CPU locate on C-CPU board.
MAIN CPU
(U3, MB91101)
Heart of the control unit

2. Memory

Table 5.7.2 lists the memories on C-CPU board.
8 Mbit Flash ROM
(U4, MBM29F800TA)
FS-2570C program is
stored.

3. LED

CR1 and CR2 are not used. These are normally on.

4. NMI SW

Not used.
SUB CPU
(U10, M38881M2)
Used to expand serial ports of
Main CPU
(For NBDP and T-CPU
connection)
256 kbit EEPROM
(U5, AT28C256)
Backup of contrast/dimmer, and
AF/RF volume and SQ settings
5-43
5.7 C-CPU Board (05P0729)/C-IF Board (05P0730)
Controls key input, display
and brilliance.
1 Mbit SRAM
(U6 and U7, K6T1008C2E)
Used by C-CPU as working
memory
Table 5.7.1 C-CPU
Gate Array
(U9, LZ9GF18)
Table 5.7.2 Memories