DIGITAL-LOGIC SM800/900DK, Technical User'S Manual

Page: 86 / 103

DIGITAL-LOGIC AG
SM800/900DK Technical Manual V1.2B
86
;-----------------------------------------------------------------------------
; Configurate logical device 9 (GPIO3)
;-----------------------------------------------------------------------------
MOV DX,2EH
MOV AL,07H
OUT DX,AL ; point to Logical Device Number Reg.
MOV DX,2FH
MOV AL,09H
OUT DX,AL ; select logical device 9 (GPIO3)
;
MOV DX,2EH
MOV AL,30H
OUT DX,AL ; point to GPIO3 activation register
MOV DX,2FH
MOV AL,01H ; to deactivate GPIO3 - write "0"
OUT DX,AL ; Activate GPIO3
;
;CRF0 (GP30-GP35 I/O selection register. Bit 7-6: Reserve)
;When set to a '1', respective GPIO port is programmed as an input port.
;When set to a '0', respective GPIO port is programmed as an output port.
MOV DX,2EH
MOV AL,0F0H
OUT DX,AL ; select CRF0
MOV DX,2FH
IN AL, DX ; read current state of I/O selection CRF0 reg.
AND AL, ... ; user masks for separated IOs
OR AL, ... ; ----""----
OUT DX,AL ; update CRF0
;
;