單片機10秒倒計時c語言匯編語言程序

①匯編語言：ORG 0000HAJMP MAINORG 000BHAJMP INTT0ORG 0030HMAIN:CLR P2.7MOV DPTR,#TABCLR AMOV R2,#0HMOV R3,#0HMOV TMOD,#01HMOV TH0,#4CHMOV TL0,#00HSETB EASETB ET0SETB TR0HERE: CJNE R2,#14H,HEREMOV R2,#0HPUSH ACCMOVC A,@A+DPTRMOV P0,APOP ACCINC AINC R3    CJNE R3,#0AH,HEREMOV R3,#00H        ;此處用DJNZ 更方便，只不過R3的初始值;要設置為0AH,同時取消INC R3指令（此行上面第二行）   CLR AAJMP HEREORG 80HINTT0:MOV TH0,#4CHMOV TL0,#00HINC R2RETITAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90HEND②C語言#include#define uint unsigned int#define uchar unsigned charsbit p27=P2^7;//數碼管位選端定義uchar c,i;//數碼管譯碼表unsigned char code NumDecode[] ={0XC0,//;00XF9,//;10XA4,//;20XB0,//;30X99,//;40X92,//;50X82,//;60XF8,//;70X80,//;80X90,//;9};void main(){i=0;//10秒計時設置c=0;//中斷次數計數p27=1;//數碼管位選端關閉TMOD=1;//設置定時器0為工作方式1TH0=(65536-46080)/256;//定時50ms高8位求模TL0=(65536-46080)%256;//定時50ms低8位求余EA=1;//開總中斷ET0=1;//定時器0中斷TR0=1;//啟動定時器0while(1){if(c==20)//50ms中斷20次{c=0;i++;//倒計時總數每秒減1}if(i<10){p27=0;//數碼管位選選通P0=NumDecode[i];//顯示數據}else  //循環計時設置{i=0;}}}void timer0() interrupt 1//定時器0中斷入口{TH0=(65536-46080)/256;//定時器重新賦初值TL0=(65536-46080)%256;c++;//中斷次數}