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Appendix C Digital I/O
One of digital circuit’s characteristics is its fast response to high or low signal.
This kind of response is highly needed for harsh and critical industrial operating
environment. Therefore, ICPMB-7880 is designed with 8-bit digital
Inputs/Outputs.
There are two kinds of signals (Input and Output) used by the Digital I/O function.
These signals are used to control external devices that need On/Off circuit or TTL
devices. User must set the Onboard Digital I/O of Peripheral Setup on BIOS setup
to one of the address available to use the Digital I/O function, and select the type
of the Digital I/O as Inputs/Outputs.
When one of the signals has been selected, users can read or write data to the
system through the Digital I/O function.
Example of a debug program:
Onboard Digital I/O set to 2D9h
Onboard Digital Mode set to Output.
-o 2D9 0F
;;GPO(bit0~3) =00001111b
