DMP Electronics eBOX-3350MX-AP Manual do Utilizador descarregar pdf (Página 56)

Jan Yin Chan Electronics Co.,LTD. 386SX Single Chip PC

M6117D : System on a chip

DM&P

Jan Yin Chan Electronics Co,. LTD. M6117D 386SX Single Chip PC Page 55

8F-1,No.22,Wuchyuan 2RD.,Hsin Chuang city Taipei Hsien, Taiwan, R.O.C. Tel: 886-(02) 2298-0770 Fax: (02) 2299-1883

Section 5 : Programming Guide

5.1 Basic Procedure and Macro Definition

a) Delay

IO_Delay MACRO

jcxz $+2

ENDM

b) Unlock chipset configure registers

Open_Chip MACRO

mov al, 013h

out 022h, al

IO_Delay

mov al, 0c5h

out 023h, al

IO_Delay

ENDM

c) Lock chipset configure registers

Close_Chip MACRO

mov al, 013h

out 022h, al

IO_Delay

mov al, 000h

out 023h, al

IO_Delay

ENDM

d) Write data to configure register

; INPUT : AH - INDEX#

; INPUT : AL - Data

; ACTION : Write the value of AL into the value of AH INDEX

; Interrupt controller and Stack are available

Write_To_Chip PROCEDURE

cli

push ax

Open_Chip

pop ax

out 022h, al

IO_Delay

xchg ah, al

out 023h, al

IO_Delay

xchg ah, al

push ax

Close_Chip

pop ax

sti

ret

ENDP

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