单片机4人抢答器.doc

我们要课设 就做MCS51系列单片机4人抢答器 其中1人按按钮就灯亮和发出声响！希望有做过这个课设的人共享下谢谢了！KEYBUF EQU 30H ;把30H地址定义为KEYBUF Y1 EQU 40H ;定义存放分值 Y2 EQU 41H Y3 EQU 42H Y4 EQU 43H S1 EQU 50H ;定义存放按键标号 ORG 0000H LJMP MAIN ORG 0030HMAIN: CLR Y1 CLR Y2 CLR Y3 CLR Y4 MOV R4,#1H LJMP NOKEY1KAI: MOV KEYBUF,#2WAIT: MOV P3,#0FFH CLR P3.4 MOV A,P3 ANL A,#0FH ;把A的高4位清零 XRL A,#0FH ;把低4位求反 JZ NOKEY1 ;A为0跳转到 NOKEY1 LCALL DELY10MS ; 按下不到10ms则转到第二行扫描 MOV A,P3 ANL A,#0FH ;把A的高4位清零 XRL A,#0FH ;把低4位求反 JZ NOKEY1 ;A为0跳转到 NOKEY1 MOV A,P3 ANL A,#0FH ;把A的高4位清零 CJNE A,#0EH,NK1 MOV KEYBUF,#1 LJMP DK1 NK1:CJNE A,#0DH,NK2 MOV KEYBUF,#2 LJMP DK1 NK2:CJNE A,#0BH,NK3 MOV KEYBUF,#3 LJMP DK1 NK3:CJNE A,#07H,NK4 MOV KEYBUF,#4 LJMP DK1 NK4: NOPNOKEY1: MOV P3,#0FFH CLR P3.5 MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY2 ;A等于0跳转 LCALL DELY10MS MOV A,P3 ANL A,#0FH XRL A,#0FH JZ NOKEY2 MOV A,P3 ANL A,#0FH CJNE A,#0EH,NK5 MOV KEYBUF,#6FH LJMP DK2 NK5:CJNE A,#0DH,NK6 LCALL DELY10MS LJMP DK3 NK6:CJNE A,#0BH,NK7 LJMP DK4 NK7:CJNE A,#07H,NK8 MOV KEYBUF,#6FH LJMP DK2 NK8:NOPNOKEY2: LJMP XIANSHI TIAOHUI: CJNE R4,#0H,NOKEY1 ;不相等转到NOKEY1 LJMP WAIT ;第二次扫描DK1: MOV A,KEYBUF ;数码管显示 MOV DPTR,#TABLE MOVC A,A+DPTR MOV S1,A MOV R4,#1H MOV R5,#0CH ;蜂鸣器 D0: MOV R1,#0FFH D1: MOV R0 ,#0FFH D2: DJNZ R0 , D2 CPL P3.6 DJNZ R1,D3 SJMP D4 D3: SJMP D1 D4: DJNZ R5,D0 MOV A,KEYBUF ;发光二极管显示 CJNE A,#1H,L1 CPL A MOV P1,A LJMP NOKEY1 L1: CJNE A,#2H,L2 CPL A MOV P1,A LJMP NOKEY1 L2: CJNE A,#3H,L3 INC A CPL A MOV P1,A LJMP NOKEY1 L3: RL A CPL A MOV P1,A LJMP NOKEY1DK2: MOV R5,#0CH ;蜂鸣器响 D00: MOV R1,#0FFH D11: MOV R0 ,#0FFH D22: DJNZ R0 , D22 CPL P3.6 DJNZ R1,D33 SJMP D44 D33: SJMP D11 D44: DJNZ R5,D00 MOV A,KEYBUF ;发光二极管亮 MOV P1,A MOV S1,#3FH ;数码管显示 MOV R4,#0 LJMP KAIDK3: JB P1.0,K1 INC Y1 MOV A,Y1 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 51H,A SETB P1.0 LJMP NOKEY1 K1: JB P1.1,K2 INC Y2 MOV A,Y2 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 52H,A SETB P1.1 LJMP NOKEY1 K2: JB P1.2,K3 INC Y3 MOV A,Y3 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 53H,A SETB P1.2 LJMP NOKEY1 K3: JB P1.3,K4 INC Y4 MOV A,Y4 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 54H,A SETB P1.0 SETB P1.3 LJMP NOKEY1 K4: LJMP NOKEY1DK4: JB P1.0,K10 DEC Y1 MOV A,Y1 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 51H,A SETB P1.0 LJMP NOKEY1 K10: JB P1.1,K20 DEC Y2 MOV A,Y2 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 52H,A SETB P1.1 LJMP NOKEY1 K20: JB P1.2,K30 DEC Y3 MOV A,Y3 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 53H,A SETB P1.2 LJMP NOKEY1 K30: JB P1.3,K40 DEC Y4 MOV A,Y4 MOV DPTR,#TABLE MOVC A,A+DPTR MOV 54H,A SETB P1.0 SETB P1.3 LJMP NOKEY1 K40: LJMP NOKEY1XIANSHI: MOV P0,S1 CLR P2.0 ACALL YANSHI SETB P2.0 MOV P0,51H CLR P2.1 ACALL YANSHI SETB P2.1 MOV P0,52H CLR P2.2 ACALL YANSHI SETB P2.2 MOV P0,53H CLR P2.3 ACALL YANSHI SETB P2.3 MOV P0,54H CLR P2.4 ACALL YANSHI SETB P2.4 LJMP TIAOHUIDELY10MS: MOV R6,#10 T1:MOV R7,#248 DJNZ R7,$ DJNZ R6,T1 RET YANSHI: MOV R6,