Aplex AHM-6156P, Руководство пользователя

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AHM-6156P User Manual 50
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
3.10.4 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
3.10.5 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);

Exit the extended function mode
Writing AAh to index address port will exit the extended function mode.
Example x86 assembly code:
mov dx, 4Eh
mov al, 0AAh
out dx, al
Example C code:
outportb(0x4E, 0xAA);

Select logic device number
Example x86 assembly code:
mov dx, 4Eh
mov al, 007h ;LDN selection register