51单片机 C 语言编程：单片机定时中断 -

要求：P1.0输出周期为2ms的方波，P1.1输出5ms的方波，占空比都为1：1.（高低电平一样的）。

本文引用地址: http://www.21ic.com/app/mcu/201806/764382.htm

晶振频率为24MHz。（使用T0和T1两个定时计数器）汇编或C都行。

编程如下：

//================================================

#include

#define uchar unsigned char

#define uint unsigned int

void init();

sbit P10 = P1^0;

sbit P11 = P1^1;

//----------------------------

main()

{

init();

while(1) { }

}

//----------------------------

void init()

{

TMOD = 0x11;

TH0 = (65536 - 2000) / 256; //1ms@24MHz

TL0 = (65536 - 2000) % 256;

TR0 = 1;

TH1 = (65536 - 5000) / 256; //2.5ms@24MHz

TL1 = (65536 - 5000) % 256;

TR1 = 1;

ET0 = 1;

ET1 = 1;

EA = 1;

}

//----------------------------

void timer0() interrupt 1

{

TH0 = (65536 - 2000) / 256; //1ms@24MHz

TL0 = (65536 - 2000) % 256;

P10 = ~P10;

}

//----------------------------

void timer1() interrupt 3

{

TH1 = (65536 - 5000) / 256; //2.5ms@24MHz

TL1 = (65536 - 5000) % 256;

P11 = ~P11;

}

//================================================