中斷練習--P1口輸出
——
作者:塵封往事
時間:2007-11-02
來源:中國單片機資訊網
;p1口輸出
org 00h
ljmp main
org 0bh
ljmp time0
org 30h
main: mov tmod,#01h ;定時器0,方式1
mov th0,#0d8h ;定時初值為10ms
mov tl0,#0f0h
setb tr0 ;啟動定時器
mov ie,#82h ;定時器中斷允許
mov r5,#100 ;中斷100次為1s
ljmp $
time0: push acc
push psw
mov th0,#0d8h
mov tl0,#0f0h
djnz r5,loop ;中斷100次到否
mov r5,#100
mov a,p1 ; 實現左移
rl a
mov p1,a
loop: pop psw ;中斷返回
pop acc
reti
end
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