汇编4路抢答器 - - Powered by Discuz!

标题: 汇编4路抢答器 [打印本页]

作者: 1824380946 时间: 2016-7-14 11:17
标题: 汇编4路抢答器
SK0 BIT P3.3 ;复位
SK1 BIT P3.4 ;选手1
SK2 BIT P3.5 ;选手2
SK3 BIT P3.6 ;选手3
SK4 BIT P3.7 ;选手4
ORG 0000H
LJMP MAIN
ORG 0003H
LJMP TT0
ORG 0030H
MAIN:SETB EA
   SETB EX0  ;初始化
  MOV DPTR,#TAB
MOV A,#0
MOVC A,@A+DPTR
MOV P1,A
TT0:  LCALL DELAY
   JNB SK1,A1
JNB SK2,A2
JNB SK3,A3
JNB SK4,A4
JNB SK0,A0
A1:LCALL DELAY ;显示子程序
JB SK1,A1
MOV A,#1
MOVC A,@A+DPTR
MOV P1,A
LCALL DELAY
SJMP A0
A2:LCALL DELAY
JB SK1,A1
MOV A,#2
MOVC A,@A+DPTR
MOV P0,A
LCALL DELAY
SJMP A0
A3:LCALL DELAY
JB SK1,A1
MOV A,#3
MOVC A,@A+DPTR
MOV P1,A
LCALL DELAY
SJMP A0
A4:LCALL DELAY
JB SK1,A1
MOV A,#4
MOVC A,@A+DPTR
MOV P1,A
LCALL DELAY
SJMP A0
A0:LCALL DELAY
JB SK1,A1
MOV A,#0
MOVC A,@A+DPTR
MOV P1,A
LCALL DELAY
SJMP TT0
DELAY:MOV R4,30H  ;延时子程序
DEL0: MOV R5,#50
DEL1: MOV R6,#250
DEL2: NOP
NOP
DJNZ R6,DEL2
DJNZ R5,DEL1
DJNZ R4,DEL0
RET
TAB:DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
   END

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