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Tick equ 10 ; 10 x 100us = 1ms
C100us equ 30h ; 100usè®°æ°åå
LEDBuf bit 20h
org 0
ljmp Start
org 000bh
T0Int:
push PSW
mov a, C100us+1
jnz Goon
dec C100us
Goon:
dec C100us+1
mov a, C100us
orl a, C100us+1
jnz Exit ; 100us è®°æ°å¨ä¸ä¸º0, è¿å
mov C100us, #27H ; #high(Tick)
mov C100us+1, #10H ; #low(Tick)
cpl LEDBuf ; 100us è®°æ°å¨ä¸º0, é置记æ°å¨
; ååLED
Exit:
pop PSW
reti
Start:
mov TMOD, #01h ; æ¹å¼1, å®æ¶å¨
mov TH0, #FCh ;0xfc18
mov TL0, #18h ;
mov IE, #10000010b ; EA=1, IT0 = 1
setb TR0 ; å¼å§å®æ¶
clr LEDBuf
clr P1.7
mov C100us, #27H ;#high(Tick)
mov C100us+1, #10H ;#low(Tick)
Loop:
mov c, LEDBuf
mov P1.7, c
ljmp Loop
end
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