User`s manual

OP7100 Memory, I/O Map, and Interrupt Vectors
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Other Registers
Table C-4 lists the other registers.
Table C-4. Other I/O Addresses
Address Name Data Bits Description
4000–403F CS1 Chip Select 1
4040–407F CS2 Chip Select 2
4080–40BF CS3 Chip Select 3
40C0–40FF CS4 Chip Select 4
4100–413F COLUMN Chip Select 5
4140–417F I/O Chip Select 6
41C0–41FF WDOG D0 Watchdog
8000 FSHWE Flash EPROM write enable
A000 INT1 D0 Bit 0 is the power-failure state.
C000 WDO Watchdog output