这两天在用89C51做一个按键选择的汇编程序，P2.0－P2.7分别接8个继电器，初始状态设为低电平，P3.3和P3.4分别接两个按键，初始为高电平。P3.3用于选择，程序一开始是选定P2.0 ，按一下P3.3，选择P2.1 ,再按一下P3.3选择P2.2，一直选到P2.7再回到P2.0开始继续选择。P3.4用来确定当前的选择，假如P3.3选到P2.5时，按下P3.4，那么P2.5所接的继电器导通，反之则关闭。下面是我写的程序，接触单片机时间不长，这是我写的第一个东西，不太会用中断，只能用这种笨方法来写，总觉得哪不对，又找不出来。请大家帮我看看，水平有限，见笑了。
ORG 0000H
LJMP START
ORG 0100H
START: MOV SP, #5FH
MOV P2, #00H
MOV 70H, #01H
K1: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #01H, K2 ;相等不转移
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K12
AJMP K1
K12: CPL P2.0 ;取反
MOV 70H, P3.4
K2: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #0H, K3
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K22
AJMP K2
K22: CPL P2.1
MOV 70H, P3.4
K3: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #1H, K4
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K32
AJMP K3
K32: CPL P2.2
MOV 70H, P3.4
K4: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #0H, K5
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K42
AJMP K4
K42: CPL P2.3
MOV 70H, P3.4
K5: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #1H, K6
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K52
AJMP K5
K52: CPL P2.4
MOV 70H, P3.4
K6: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #0H, K7
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K62
AJMP K6
K62: CPL P2.5
MOV 70H, P3.4
K7: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #1H, K8
CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K72
AJMP K7
K72: CPL P2.6
MOV 70H, P3.4
K8: CLR A
MOV C, P3.3
MOV ACC.0, C
CJNE A, #0H, TURN1
ACALL K81
TURN1: LJMP K1
K81: CLR A
MOV C, P3.4
MOV ACC.0, C
CJNE A, 70H, K82
AJMP K8
K82: CPL P2.7
MOV 70H, P3.4
LJMP K1
END
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