keil c51單片機 流水燈。

unsigned int n;

unsigned char m = 0, temp = 254;

sbit SPK = P1^5;

main()

{

TMOD = 0x01;

TH0 = (65536 - 1000) / 256;

TL0 = (65536 - 1000) % 256;

TR0 = 1;

ET0 = 1;

EA = 1;

P2 = temp;

while(1);

}

void T0_INT() interrupt 1

{

TH0 = (65536 - 1000) / 256;

TL0 = (65536 - 1000) % 256;

n++;

if(n >= 1000) {

n = 0;

m++;

if (m == 8) {m = 0; temp = 254;}

else {temp <<= 1; temp += 1;}

}

if(n < 500) {SPK = ~SPK; P2 = temp;}

else P2 = 255;

}

以上程序已經實驗成功。