PIC16F877单片机定时器2使用中断方式调试程序如下:
#include<pic.h>
#define uchar unsigned char
#define uint unsigned int
__CONFIG(0x3B31);
void init();
uint intnum;
void main()
{
init();
while(1)
{
/* if(intnum==5000)
{
intnum=0;
RD0=!RD0;
}*/
}
}
void init()
{
TRISD = 0x00; //设置PORTD为输出低电平
PORTD = 0x00; //
/* INTCON=0xc0;
PIE1=0x02;
TMR2=0;
PR2=100;
T2CON=0x0D;*/
INTCON = 0xc0; //允许所有中断、允许外设中断
PIE1 = 0x02; //允许TMR2与PR2匹配中断
// TMR2 = 56; //4M晶振系统,预设为(256-56=)200us
TMR2 = 0; //与PR2比较中断
PR2 = 100;
//T2CON = 0x04; //定时器2使能
//T2CON=0x05;//4预分频并使能定时器2
T2CON=0x0D; //4预分频、2后频并使能定时器2
}
void interrupt time0()
{
/* TMR2IF=0;
// TMR2=56;
// RD0=!RD0;//
intnum++;*/
TMR2IF = 0; //定时器2清除溢出中断标志位
// TMR2 = 56; //预装初值
intnum++;
if(++intnum >= 5000)//为1S、4S、8S
{
intnum = 0;
RD0 = !RD0; //反转
}
}