Question

8051单片机的晶振频率为12MHz，试用定时器中断方式编程实现从P1.0引脚输出周期为2ms的方波

Answer 1

#include <reg52.h>
#define fso=12000000
#define t0dat=65536-(fso/12)/(2/2*1000)
void main()
{
TH0=t0dat/256;
TL0=t0dat%256;
TMOD=0x1;
TR0=1;
ET0=1;
EA=1;
while(1);
}

void intt0(void) interrupt 1 using 1
{
TH0=t0dat/256;
TL0=t0dat%256;
TR0=1;
P1^0~=P1^0;
}