bcd码演示.asm

一些单片机汇编程序 流水灯 键盘 lcd A/D D/A等

;按键显示不同的显示变化
LED1  EQU  21H
LED2  EQU  22H
LED3  EQU  23H
ORG 00H
JMP START
START:MOV DPTR,#TABLE
      MOV LED3,#10H
MAIN: MOV A,P3
      MOV B,#10H
      DIV AB
      MOV LED1,A
      MOV LED2,B
      CALL SCAN
      JMP MAIN
SCAN:MOV P2,#11111011B ;扫描子程序
     MOV A,LED3
     MOVC A,@A+DPTR
     MOV P0,A
     CALL DELAY1
     MOV P2,#11111101B
     MOV A,LED2
     MOVC A,@A+DPTR
     MOV P0,A
     CALL DELAY1
     MOV P2,#11111110B
     MOV A,LED1
     MOVC A,@A+DPTR
     MOV P0,A
     CALL DELAY1
     RET
DELAY1:MOV R6,#4    ;扫描延时
D3:    MOV R7,#248
       DJNZ R7,$
       DJNZ R6,D3
       RET

TABLE:          DB 0C0H,0F9H,0A4H,0B0H,99H,92H   ;数码管显示字型表
		DB 82H,0F8H,80H,90H,88H,83H,0A7H
		DB 0A1H,86H,8EH,0FFH