1 KEY_COMMON bit P3.2 ；按键公共端
2 KEY_1 bit p0.5 ；三个按键
3 KEY_2 bit p0.4
4 KEY_3 bit p0.3
5
6 BEEP bit p2.0 ；蜂鸣器
7
8 LED_1 bit p1.7 ；六个LED灯
9 LED_2 bit p1.6
10 LED_3 bit p1.5
11 LED_4 bit p1.4
12 LED_5 bit p1.3
13 LED_6 bit p1.2
14
15 org 0000H
16 jmp MAIN
17
18 ;*******************************************
19 org 0030H ;Start program from 0030H
20 MAIN:
21 mov P0,#0FFH ;Initialize the port，初始化端口
22 mov P1,#0FFH
23 mov P2,#0FFH
24 mov P3,#0FFH
25
26 clr KEY_COMMON ;Clear the common line
27 MAIN_LOOP:
28 jb KEY_1,LAB_KEY_2 ;Wait for key down，按下按键1条跳到LAB_KEY_2，一个都没按做循环直到按了按键
29 call DELAY
30 cpl LED_1 ;Change the state of LED8，（累加器求反）
31 cpl LED_2 ;Change the state of LED7
32 jmp NEXT_LOOP
33
34 LAB_KEY_2:
35 jb KEY_2,LAB_KEY_3 ;Wait for key down
36 call DELAY
37 cpl LED_3 ;Change the state of LED6
38 cpl LED_4 ;Change the state of LED5
39 jmp NEXT_LOOP
40
41 LAB_KEY_3:
42 jb KEY_3,NEXT_LOOP ;Wait for key down
43 call DELAY
44 cpl LED_5 ;Change the state of LED4
45 cpl LED_6 ;Change the state of LED3
46 jmp NEXT_LOOP
47
48 NEXT_LOOP:
49
50 jmp MAIN_LOOP
51
52 ret
53 ;****************************************************
54 DELAY:
55 mov r7,#200
56 DELAY_LOOP:
57 mov r6,#200
58 djnz r6,$
59 mov r6,#200
60 djnz r6,$
61
62 djnz r7,DELAY_LOOP
63 ret
64 ;****************************************************
65 END
