Aplex Technology ACS-2645 - Manual (Page 51)

ACS-2645 User Manual 51
3.9 Examples of GPIO Programming
3.9.1 SuperIO Model: Winbond W83627UHG
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GPIO OUT use GP 60~63
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GPIO IN use GP 20~23
3.9.2 W83627UHG Access index port: 4Eh/4Fh
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Index Address Port: 4Eh
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Index Data Port: 4Fh
3.9.3 Configure GPIO register sequence
1. Enter the extended function mode
2. Select logic device number 8
3. Activate the logic device GPIO Port 6
4. Configure GPIO Port 6 register
5. Select logic device number 9
6. Activate the logic device GPIO Port 2
7. Configure GPIO Port 2 register
8. Exit the extended function mode
3.9.4 Read/write GPIO sequence
1. Enter the extended function mode
2. Select logic device number
3. Read/write GPIO register value
4. Exit the extended function mode
3.9.5 Software programming example

Enter the extended function mode
Writing 87h to index address port twice will enter the extended function mode.
Example x86 assembly code:
mov dx, 4Eh
mov al, 87h
out dx, al
out dx, al
Example C code:
outportb(0x4E, 0x87);
outportb(0x4E, 0x87);
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Exit the extended function mode
Writing AAh to index address port will exit the extended function mode.