📄 单片机变频输出.htm
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<P align=left><FONT font>;变频输出！按p3.2连续输出50hz,1KHZ,1KHZ窄脉冲，
停止。输出口P3.3。<BR><SPAN lang=EN-US
style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial">;********************************************************************************<BR>;*
(程序转载请著明出处
，未声明可适应本站腾龙/isp开发套件/倚天版开发套件
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</SPAN>*<SPAN lang=EN-US
style="FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: 宋体; mso-bidi-font-family: Arial"> <BR>;********************************************************************************</SPAN><BR>;p3.2
control p1.3 (led)<BR>;p3.4 control p3.3(buzzer)<BR><BR>org 0000h<BR>ajmp
main0<BR><BR>org 000bh<BR>ajmp timer0<BR>org 001bh<BR>ajmp timer1<BR>org
0030h<BR>MAIN0:<BR>CLR 21H ;清标志位<BR>mov 30h,#01h<BR>mov tmod,#12h
;设定定时器工作方式<BR>mov ie,#8ah ;开中断<BR>mov th0,#(256-50) ;设定时初值<BR>mov
tl0,#(256-50)<BR>mov th1,#high(65536-50000)<BR>mov
tl1,#low(65536-50000)<BR>mov r0,#00h<BR>main:<BR>mov c,p3.2 ;检测按键<BR>jc
testp34<BR>MOV R6,#200 ;设定0.5秒延时<BR>MOV R7,#200<BR>ajmp
tt0<BR>testp34:<BR>mov c,p3.4 ;检测按键<BR>jc main<BR>ajmp
insert<BR>TT0:<BR>JNB 21H,TT2 ;判断灯的状态<BR>tt:<BR>mov c,p3.2<BR>jnc
tt1<BR><BR>JNB 20H,MAIN ;检测0.5秒时间到否<BR>CLR 20H <BR>AJMP
TT3 <BR>TT2:<BR>mov c,p3.2 ;检测按键<BR>jnc tt2<BR>TT3:<BR>CPL 21H
;取反灯的状态<BR>cpl p1.3<BR>ajmp main<BR><BR>TT1:
NOP<BR>NOP<BR>NOP<BR>NOP<BR>NOP<BR>NOP<BR>DJNZ R6,TT<BR>MOV
R6,#200<BR>DJNZ R7,TT<BR>MOV R7,#200<BR>SETB 20H<BR>AJMP
TT <BR>insert:<BR>lcall delay10ms<BR>mov c,p3.4 ;检测按键<BR>jc
main<BR>ins1:<BR>mov c,p3.4<BR>jnc ins1 ;等待键释放<BR>mov a,30h ;状态切换<BR>rl
a<BR>mov 30h,a<BR>jb acc.0,l1<BR>jb acc.1,l2<BR>jb acc.2,l3<BR>jb
acc.3,l4<BR>jb acc.4,l1<BR>jb acc.5,l2<BR>jb acc.6,l3<BR>jb
acc.7,l4<BR>ajmp main<BR>l1: mov r5,#2 ;10%占空比,脉冲频率1KHZ<BR>setb tr0<BR>clr
tr1<BR>ajmp l5<BR>l2: mov r5,#5 ;25%占空比,脉冲频率1KHZ<BR>setb tr0<BR>clr
tr1<BR>ajmp l5<BR>l3: clr tr0<BR>clr tr1<BR>setb p3.3 ;全为高电平<BR>ajmp
l5<BR>l4: clr tr0<BR>setb tr1<BR>ajmp l5<BR>l5: ajmp main<BR><BR>timer0:
;定时器0中断服务程序,产生50US定时<BR>push acc<BR>push psw<BR>mov th0,#(256-50)<BR>mov
tl0,#(256-50)<BR>inc r0<BR>mov a,r0<BR>mov 31h,r5<BR>cjne
a,31h,compend<BR>cpl p3.3<BR>ajmp exit<BR>compend:<BR>cjne
a,#20,exit<BR>mov r0,#00h<BR>cpl p3.3<BR>exit:<BR>pop psw<BR>pop
acc<BR>reti<BR>timer1: ;定时器1中断服务程序,产生50mS定时<BR>push acc<BR>push psw<BR>mov
th1,#high(65536-50000)<BR>mov tl1,#low(65536-50000)<BR>cpl p3.3<BR>pop
psw<BR>pop acc<BR>reti <BR>delay10ms:<BR>mov 40h,#50<BR>ttp:<BR>mov
41h,#100<BR>djnz 41h,$<BR>djnz
40h,ttp<BR>ret <BR>end<BR></FONT></P></TD></TR></TBODY></TABLE></DIV></CENTER></BODY></HTML>
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