text1.c

单片机快速入门原程序

#include <reg51.h>
#include<stdio.h>
#define P8253ControlWord 0XFFFF //8253控制字
#define P8253Channel0 0X3FFF  //8253通道0地址
#define P8253Channel1 0X7FFF  //8253通道1地址
#define P8253Channel2 0XBFFF //8253通道2地址
#define uchar unsigned char	//uchar代表单个字节无符号数
#define uint unsigned int	//uint无符号字
void WriteControlWord(uchar c8253data);
void WriteToChannel0(uchar c8253data);
void WriteToChannel1(uchar c8253data);
void WriteToChannel2(uchar c8253data);
xdata uchar c8253word=0;
Uart_Init();			//输出口初始化
void Delay(); 		//延时程序
main()
{	Uart_Init();	//
	P0=0XFF;		//端口初始化为0xFF
	P1=0XFF;		
	P2=0XFF;
	P3=0XFF;
	c8253word=0X10;//通道0 方式0
	WriteControlWord(c8253word);//写入控制字
	WriteToChannel0(0X80);//写入计数初值
	c8253word=0X56;//通道1 方式3
	WriteControlWord(c8253word);//写入控制字
	WriteToChannel1(0X80);//写入计数初值
	c8253word=0X98;//通道2 方式4
	WriteControlWord(c8253word);//写入控制字
	WriteToChannel2(0X80);//写入计数初值
	while(1);
}
Uart_Init()
	{SCON = 0x52;    /* 设置串行口控制寄存器SCON*/
	 TMOD = 0x21;    /* 12M时钟时波特率为2400  */
	 TCON = 0x69;    /* TCON */
	 TH1 =  0xf3;    /* TH1 */
	}
void Delay() 	//延时程序
	{	uint i;
		for(i=0;i<200;i++);
	}
void WriteControlWord(uchar c8253data)//写控制字
{		*((uchar xdata *)P8253ControlWord)=c8253data;
}
void WriteToChannel0(uchar c8253data)//写通道0初值
{	*((uchar xdata *)P8253Channel0)=c8253data;
}
void WriteToChannel1(uchar c8253data)//写通道1初值
{*((uchar xdata *)P8253Channel1)=c8253data;
}
void WriteToChannel2(uchar c8253data)//写通道2初值
{	*((uchar xdata *)P8253Channel2)=c8253data;
}