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$MOD51
START:
LOOP:
DLOOP:
ORG
AJMP
ORG
AJMP
ORG
MOV
MOV
00H
START
03H
EX0ISR
100H
SP,#60H
IE,#00H
MOV
MOV
MOV
SETB
R5,#0
R6,#0
R1,#6
P1.5
SETB
MOV
DJNZ
CLR
MOV
DJNZ
DJNZ
P1.7
R2,#05
R2,$
P1.7
R2,#5
R2,$
R1,LOOP
;1us
;1us
;2us on (5*2+1=11us)
;1us
;1us
;2us off(5*2+1=11us)
;25us 1peroid *5 =0.3ms
MOV
MOV
DJNZ
MOV
DJNZ
DJNZ
R1,#12 ;TIME DELAY FOR THE DETECT SIGNAL PERIOD
R2,#06 ;1us
R2,$
;2us on (5*2+1=11us)
R2,#6
;1us
R2,$
;2us off(5*2+1=11us)
R1,DLOOP;26us 1peroid *5 =0.6ms
MOV
SETB
IE,#81H ;SETUP TO DETECT THE SIGNAL
IT0