ROHS ITX-i2705, User Manual

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Appendix
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Below are the source codes written in assembly & C, please take them
for Digital I/O application examples.
Assembly Code
;-- Initial W83627hf --
mov AX, 2Eh
mov DX, AX
mov AL, 87h
out DX, AX ;
out DX, AX ; initial W83627HF start
;--
mov AX, 2Eh
mov DX, AX
mov AL, 2Ah
out DX, AL ; Select CR2A
mov AL, 0FCh
INC DX
out DX, AL ; Set CR2A bit 7=1 as GPIO port 1
;--
mov AX, 2Eh
mov DX, AX
mov AL, 07h
out DX, AL ; Point to Logical Device Selector
mov AL, 07h
inc DX
out DX, AL ; Select Logical Device 7
;--
mov AX, 2Eh
mov DX, AX
mov AL, 30h
out DX, AL ; select CR30
mov AL, 01h
inc DX
out DX, AL ; set bit0=1, GPIO port 1 active
;--
mov AX, 2Eh
mov DX, AX
mov AL, 0F0h
out DX, AL ; select CRF0, GP I/O select
mov AL, 00h
Appendix 5: Digital I/O Setting