EM78P153范例程序

JMP EXIT_2 ;C=1,COUNTER>20

MOV A,COUNTER

BC PSW,C

SUB A,@16 ;16-A

JBC PSW,C

JMP EXIT_2 ;C=0,COUNTER<16

BS FLAG,LEAD

JMP JUDGE_REPEAT_CODE_2

EXIT_2:

RET

JUDGE_REPEAT_CODE_2:

CLR COUNTER ;清计数器

JUDGE_REPEAT_CODE_3:

JBS PORT6,INPUT

JMP JUDGE_REPEAT_CODE_4

CALL DELAY0.5MS

JBS PORT6,INPUT

JMP JUDGE_REPEAT_CODE_4

INC COUNTER

JMP JUDGE_REPEAT_CODE_3

JUDGE_REPEAT_CODE_4:

MOV A,COUNTER

BC PSW,C

SUB A,@7 ;7-A

JBS PSW,C

JMP NO_REPEAT ;C=0,COUNTER>7

JMP YES_REPEAT ;C=1,COUNTER<7

NO_REPEAT:

BC FLAG,REPEAT

CLR REPEAT_COUNTER

RET

YES_REPEAT:

BS FLAG,REPEAT

INC REPEAT_COUNTER

RET

;****************延时0.5mS子程序*********************

DELAY0.5MS:

MOV A,@2

MOV LP_CNT0,A

DELAY0.5MS_1:

MOV A,@82

MOV LP_CNT1,A

DELAY0.5MS_2:

NOP

NOP

NOP

DJZ LP_CNT1

JMP DELAY0.5MS_2

DJZ LP_CNT0

JMP DELAY0.5MS_1

RET

 

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