helloc51.c

8051 单片机端口设置程序 基于STC89C51芯片

#include <stdio.h>
#include <reg52.h>

sbit P2_4 = P2^4;
sbit P2_5 = P2^5;

void Delayms(unsigned int ms)
{
    unsigned int i,j;
    for(i=0;i<ms;i++)
	{
    	for(j=0;j<113;j++)
		{
			;
		}
	}
}

main()
{
	P0=0x00;
	P1=0x00;
	P2=0x20;

	while(1)
	{
		Delayms(500);
		P2_4=1;
		Delayms(500);
		P2_4=0;
	}
}