59分59秒倒計(jì)時(shí)程序及仿真顯示

1、一、59分59秒倒計(jì)時(shí)程序：/*倒計(jì)時(shí)及顯示程序,適用于尋跡小車實(shí)驗(yàn)板*/#include#define uchar unsigned char#define uint unsigned intuchar code table=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e;/共陽(yáng)七段編碼uchar temp=0;/定義定時(shí)器溢出計(jì)數(shù)變量，每隔50ms產(chǎn)生1次溢出，temp加1/*uint time=5959;/定義倒計(jì)時(shí)變量，當(dāng)temp計(jì)數(shù)加20(20x50ms=1s)時(shí)，time

2、減1*/uchar miao=59;uchar fen=59;sbit P0_7=P07;/*-定時(shí)計(jì)數(shù)器T0及其中斷初始化函數(shù)-*/void timer0init(void) TMOD=0x01;/設(shè)置定時(shí)器0為工作方式1 TH0=(65536-50000)/256;/16位計(jì)數(shù)初值除以256得到高8位初值 TL0=(65536-50000)%256;/16位計(jì)數(shù)初值除以256的余數(shù)得到低8位初值 EA=1;/開(kāi)總中斷 ET0=1;/開(kāi)定時(shí)器0中斷 TR0=1;/啟動(dòng)定時(shí)器0/*-延時(shí)函數(shù)-*/void delay(uint n) uint i,j; for(i=n;i0;i-) for(j

3、=124;j0;j-);/*定時(shí)計(jì)數(shù)器中斷程序，每當(dāng)定時(shí)計(jì)數(shù)器溢出時(shí)觸發(fā)中斷，執(zhí)行該程序*/void time0() interrupt 1 TH0=(65536-50000)/256;/重裝初值TL0=(65536-50000)%256; if(temp=20) temp=0; if(miao=0) miao=59; if(fen=0) fen=59; else fen-; else miao-; else temp+;/*-顯示函數(shù)-*/void display(void) P1=0xfe;/輸出個(gè)位的位碼 P0=tablemiao%10; /輸出時(shí)間個(gè)位的段碼 delay(5); /亮5ms P1=0xfd;/輸出十位的位碼 P0=tablemiao/10; /輸出時(shí)間十位的段碼 delay(5); /亮5ms P1=0xfb;P0=tablefen%10;P0_7=0;delay(5);P1=0xf7;P0=tablefen/10;delay(5);/*-主函數(shù)-*/void main(void) timer0init();/調(diào)用初始化