Main Control Circuit - Xerox DocuMate 252 Service Manual

3.2.2 Main control circuit

This scanner is controlled by the 80C32. The 80C32 is configured with a 64-KB
external ROM program area, a 256-BYTE internal RAM work area, a 64-KB external
RAM work area, 2 timer / counters, 4 I/O ports, 2 external interrupts, and 2 internal
interrupts for 2 internal timer / counters.
Address Maps:
•
ROM program area
•
Internal RAM working area:
External SRAM working area:
:
0000
64KB Program
FFFF
00
256-byte
Internal Registers
FF
0000
64 KB
External Program
FFFF
3-3
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