;
ORG 0000H
MOV TMOD, #02H
MOV TH0, #156
MOV TL0, #156
SETB TR0
L1: MOV R2, #10
L2: JNB TF0, $
CLR TF0
SETB P1.4
DJNZ R2, L2
CLR P1.4
SJMP L1
END
Output equ P1.4
Loop:
setb c
mov Output,c
lcall DELAY900US
setb c
mov Output,c
lcall DELAY100US
ljmp loop
DELAY900US: ;误差 0us
MOV R6,#45H
DL0:
MOV R5,#05H
DJNZ R5,$
DJNZ R6,DL0
RET
DELAY100US: ;误差 0us
MOV R6,#01H
DL0:
MOV R5,#2FH
DJNZ R5,$
DJNZ R6,DL0
RET
ORG 0000H
LJMP MAIN
ORG 0300H
MAIN: MOV TMOD, #01H
MOV TH0,#0FFH
MOV TL0,#09CH
MOV IE,#00H
SETB TR0
CLR TF0
SETB P1.4
LOOP:JBC TF0,ZCZ
AJMP LOOP
ZCZ:CLR TR0
CLR TF0
MOV TH0,#OFFH
MOV TL0,#09CH
CPL P1.4
SETB TR0
AJMP LOOP
不足之处，敬请见谅！
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