?? bcd.asm
字號(hào):
LED1 EQU 21H
LED2 EQU 22H
LED3 EQU 23H
ORG 00H
JMP START
START:MOV DPTR,#TABLE
MOV LED3,#10H
MAIN: MOV A,P1
MOV B,#10H
DIV AB
MOV LED1,A
MOV LED2,B
CALL SCAN
JMP MAIN
SCAN:MOV P2,#00001000B ;掃描子程序
MOV A,LED3
MOVC A,@A+DPTR
MOV P0,A
CALL DELAY1
MOV P2,#00000100B
MOV A,LED2
MOVC A,@A+DPTR
MOV P0,A
CALL DELAY1
MOV P2,#00000010B
MOV A,LED1
MOVC A,@A+DPTR
MOV P0,A
CALL DELAY1
RET
DELAY1:MOV R6,#4 ;掃描延時(shí)
D3: MOV R7,#248
DJNZ R7,$
DJNZ R6,D3
RET
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH;共陰字碼表
DB 07H,7FH,6FH,77H,7CH,39H,5EH
DB 79H,71H,76H,73H,3EH,00H
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