Iei-integration IMBA-G412ISA v2.00 Manual de usuario descargar pdf (Pagina 160)

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IMBA-G412ISA ATX Motherboard

E.1 Introduction

The digital I/O is used for machine control and automation.

E.2 DIO Connector Pinouts

Located in the Connectors section of this document.

E.3 Assembly Language Example

;**************************************************

; DIO Port: 0A21h[3:0] (4 Out)

; 0A22h[3:0] (4 In)

;**************************************************

;==================================================

; Get current input and output values into AL register

; AL: bit0~bit3 as output value

; bit4~bit7 as Input value

;==================================================

mov dx, 0A21h ; GPIO output I/O base address

in al, dx ; Get output status

jmp $+2 ; Wait

and al, 0Fh

mov bl, al ; Move al to bl temporarily

inc dx ; sets dx to 0A22h

in al, dx ; Get input status

jmp $+2 ; Wait

and al, 0Fh

rol al, 4 ; Shift input values over

or al, bl ; Merge all results into AL

; AL: bit0~bit3 as output value

; bit4~bit7 as input value

;==================================================

; Output value (x) to GPIO

; AL: bit0~bit3 as output value

;==================================================

mov al, 0xh ; x is the output value (0 ~ Fh)

mov dx, 0A21h ; GPIO output I/O base address

out dx, al ; bit0 ~ bit3 as Output value

; bit4 ~ bit7 are Reserved

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Iei-integration IMBA-G412ISA v2.00 Manual de usuario Pagina 160