led指示的二进制数加法显示

按下K1键， LED指示的二进制数加1；按下K2键， LED指示的二进制数加2；按下K3键， LED指示的二进制数加3；按下K4键， LED指示的二进制数加4。

按键三次k1键后如图显示：

K1：代表加1，按了三次后为十进制的3，换位二进制后为0011，由于当引脚输出为零的时候亮，所以为1100 代码： K1 BIT P1.4 K2 BIT P1.5 K3 BIT P1.6 K4 BIT P1.7 ORG 0000H LJMP START1 ORG 0060H

START1:

MOV DPTR,#TAB1

MOV A,#00H PUSH ACC

START: MOV P1,#0FFH MOV A,P1

CJNE A,#0FFH,LOP1 LJMP START;无按下

LOP1:ACALL DELAY;有按下 MOV P1,#0FFH MOV A,P1

CJNE A,#0FFH,LOP2 ;有效按键 LJMP START ;无效按键

LOP2:JNB ACC.4,KEY1;判断键号 JNB ACC.5,KEY2 JNB ACC.6,KEY3 JNB ACC.7,KEY4 SJMP START

KEY1:

WT1: JNB K1,WT1

POP ACC ADD A,#1

PUSH ACC

MOVC A,@A+DPTR MOV P2,A

LJMP START KEY2:

WT2: JNB K2,WT2

POP ACC ADD A,#2 PUSH ACC

MOVC A,@A+DPTR MOV P2,A

LJMP START KEY3:

WT3: JNB K3,WT3

POP ACC ADD A,#3

PUSH ACC

MOVC A,@A+DPTR

MOV P2,A

LJMP START KEY4:

WT4: JNB K4,WT4 POP ACC ADD A,#4 PUSH ACC

MOVC A,@A+DPTR

MOV P2,A

LJMP START

DELAY:MOV R0,#255 D1:MOV R1,#255 DJNZ R1,$ DJNZ R0,D1 RET TAB1:

DB

0FFH,0FEH,0FDH,0FCH,0FBH,0FAH,0F9H,0F8H,0F7H,0F6H,0F5H,0F4H,0F3H,0F2H,0F1H,0F0H END