bayin.asm

来自「单片机解码红外遥控器的信号后通过与电脑串口通讯控制电脑音乐播放」· 汇编 代码 · 共 71 行

org 0000h
ajmp main
org 000bh
 ajmp timer0
org 0030h

timer0:
clr ea
djnz 33h,exit
mov 33h,53h
djnz 32h,exit
mov 32h,52h
djnz 31h,exit1
mov 31h,51h
djnz 30h,exit1
setb f0
ajmp exit
exit1: cpl p2.1
exit: setb ea
reti
main:
mov tmod,#02h
mov ie,#82h
mov th0,#254
mov tl0,#254
mov dptr,#tab
main1:
mov 40h,#00h
loop:
clr ea
mov a,40h
movc a,@a+dptr
mov 30h,a
mov 50h,a
inc 40h
mov a,40h
movc a,@a+dptr
mov 31h,a
mov 51h,a
inc 40h
mov a,40h
movc a,@a+dptr
mov 32h,a
mov 52h,a
inc 40h
mov a,40h
movc a,@a+dptr
mov 33h,a
mov 53h,a
setb ea
setb tr0
jnb f0,$
clr f0
inc 40h
mov a,40h
cjne a,#40,loop
ajmp main1
tab: ; 30h,31h,32h,33h
db 2,25,24,16 ;low frequency
db 4,25,24,8
db 8,25,24,4
db 12,25,12,4
db 20,25,6,4
db 30,25,5,4
db 40,25,4,4
db 50,25,3,4
db 60,25,2,4
db 70,50,1,4

end