微处理器8086+8255实现七段数码管

同理 四个开关 控制数码管显示的二进制数

0000-1111 即0-15

                    
DATAS    SEGMENT        ;数据段

PORTA EQU 0F0H
PORTB EQU 0F2H
PORTC EQU 0F4H
CTRL EQU  0F6H

TABLE      DB    40H,79H,24H,30H,19H,12H,02H,78H
DB    00H,18H,08H,03H,46H,21H,06H,0EH




DATAS    ENDS


EXTRA    SEGMENT    ;    ;附加段



EXTRA    ENDS



STACK    SEGMENT  PARA  STACK  ‘STACK’   ;堆栈段
STAPN    DB     100 DUP (00H)    ;定义100字节空间
TOP    EQU  LENGTH  STAPN
STACK    ENDS



CODE    SEGMENT
MAIN    PROC   FAR            ;过程定义语句
;说明4个段寄存器分别与哪些段有关
ASSUME  CS:CODE, DS:DATAS,ES:EXTRA,SS:STACK

START:
MOV AX,DATAS
MOV DS,AX

MOV AX, EXTRA
MOV ES,AX

MOV AX,STACK
MOV SS,AX


MOV DX,CTRL
MOV AL,90H
OUT DX,AL

KEY_TEST: MOV DX,PORTA
IN AL,DX

AND AL,0FH
MOV BX,OFFSET TABLE
XLAT


MOV DX,PORTB
OUT DX,AL

MOV CX,40H
CALL DELAY

JMP KEY_TEST



RET
MAIN    ENDP        ;MAIN过程结束

DELAY PROC

PUSH CX

LOOP $

POP CX

RET
ENDP


CODE     ENDS                  ;代码段结束
END   MAIN    ;整个源代码结束




; [SOURCE]: C:\Users\yuhong\Desktop\EXP8255\EXP4-2\EXP4-2.asm