单片机汇编语言抢答器 -

标题: 单片机汇编语言抢答器 [打印本页]

作者: xiaojames 时间: 2018-7-11 11:10
标题: 单片机汇编语言抢答器
汇编源代码：

      ORG 0000H
      AJMP START
      ORG 000BH
      AJMP TIME0
      ORG 0040H
START:  MOV SP,#60H
      SETB P3.7
      SETB P3.0

L1:    JB P3.0,$ ;等待主持人按键
      JNB P3.0,$
      MOV P2,#0C0H ;数码管显示0
;5s初始化
      MOV 30H,#00H  ;软件计数器清00
      MOV TMOD,#01H
      MOV TH0,#3CH
      MOV TL0,#0B0H
      SETB EA
      SETB ET0
      SETB TR0    ;启动5s计时
LOOP: SJMP LOOP

TIME0:  LCALL S0

      MOV TL0,#0B0H
      MOV TH0,#3CH
      INC 30H
      MOV R1,30H
      CJNE R1,#100,RET0
      DEC SP
      DEC SP
      LJMP L1
RET0: RETI

s0:    MOV A,#0FFH
      MOV P1,A
      MOV A,P1 ;将选手按键状态送寄存器A
      XRL A,#0FFH
      JNZ L2
      RET

L2:    JNB P1.0,S1
      JNB P1.1,S2
      JNB P1.2,S3
      JNB P1.3,S4
      JNB P1.4,S5
      JNB P1.5,S6
      JNB P1.6,S7
      JNB P1.7,S8

S1:    MOV P2,#0F9H
      LJMP SS
S2:    MOV P2,#0A4H
      LJMP SS
S3:    MOV P2,#0B0H
      LJMP SS
S4:    MOV P2,#99H
      LJMP SS
S5:    MOV P2,#92H
      LJMP SS
S6:    MOV P2,#82H
      LJMP SS
S7:    MOV P2,#0F8H
      LJMP SS
S8:    MOV P2,#80H
      LJMP SS

;扬声器重复发声
      MOV R3,#0FFH
SS:    CLR P3.7
      LCALL DELAY
      SETB P3.7
      LCALL DELAY
      DJNZ R3,SS
;准备进行下一轮抢答
      JB P3.0,$
      JNB P3.0,$
      MOV P2,#0C0H
      LJMP S0

;短延时
DELAY:  MOV R1,#249
LOP: NOP
      NOP
      DJNZ R1,LOP
      RET
      END

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