Portwell RUBY-9715VG2AR - Example

System Installation
RUBY-9715VG2AR User’s Manual 3-13
3.6.3 Example
Define GPIO4 as output pin, and output “0” to this pin.
mov dx,2eh ; Enter Configuration Mode
mov al,87h
out dx,al
jmp $+2
out dx,al
mov dx,2eh
mov al,29h ; Read CR29
out dx,al
mov dx,2fh
in al,dx
or al,40h ; Set GPIO multiplexed pins as bit 7,6 as 01 for
; Group 1 as GPIO
mov ah,al
mov dx,2eh
mov al,29h
out dx,al
mov dx,2fh
mov al,ah
out dx,al
mov dx,2eh
mov al,07h ; Point to LDN7
out dx,al
mov dx,2fh
mov al,07h
out dx,al
mov dx,2eh ; Read CR30
mov al,30h
out dx,al
mov dx,2fh
in al,dx
or al,01h
mov ah,al
mov dx,2eh ; CR30_Bit0.P1
mov al,30h
out dx,al
mov dx,2fh
mov al,ah
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