Acnodes PCH 3582 - Manual (Page 53)

out dx, al
Example C code:
outportb(0x4E, 0xE6); //GPIO I/O selection reg.
outportb(0x4F, 0x0); //0
– normal, 1 – inverted
outportb(0x4E, 0xE4); //GPIO inversion reg.
outportb(0x4F, 0xFF); //0
– Output, 1 - Input
or
outportb(0x4E, 0xE4); //GPIO inversion reg.
outportb(0x4F, 0xF0); //0
– Output, 1 – Input
Read GPIO value
Example x86 assembly code:
mov dx, 4Eh
mov al, 0E5h ;GPIO data reg.
out dx, al
mov dx, 4Fh
in al, dx ;Bit[3::0] = GPI[3::0] value
Example C code:
outportb(0x4E, 0xE5); //GPIO data reg.
GP = inportb(0x4F); //Bit[3::0] = GPI[3::0]
Write GPIO value
Example x86 assembly code:
;Set GPO62
mov dx, 4Eh
mov al, 0E5h ;GPIO data reg.
out dx, al
mov dx, 4Fh
in al, dx
or al, 00000100b ;Bit2 = GPO62
out dx, al
;Clear GPO62
mov dx, 4Eh
mov al, 0E5h ;GPIO data reg.
out dx, al
mov dx, 4Fh
in al, dx
and al, not 00000100b