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1.11 Digital I/O
One of the characteristics of digital circuit is its fast response to high or low signal.
This kind of respond is badly needed for harsh and critical industrial operating
environment. That is why we design 4-bit digital inputs and 4-bit digital outputs
on the WAFER-4821.
Digital Input and Output, generally, are control signals. You can use these signals
to control external devices that needs On/Off circuit or TTL devices. The register
address is 340H (or 240H, 260H) (configured with BIOS setting).
•
CN12: Digital I/O
PIN
Signal Name
PIN
Signal Name
1 GND 6 VCC
2 DO3 7 DO2
3 DO1 8 DO0
4 DIN3 9 DIN2
5 DIN1 10 DIN0
