单片机(c语言 第二版)期末考试试题及答案

Question

如题所述

Answer 1

#include <reg51.h>
#define led P1;
int x=0;
void InitTimer0(void)
{
TMOD = 0x01;
TH0 = 0x0D8;
TL0 = 0x0F0;
x=1;
}

viod main()
{
EA=1;
TMOD = 0x01;
TH0 = 0x0D8;
TL0 = 0x0F0;
EA = 1;
ET0 = 1;
TR0 = 1;
led=0x01;
while(1);
{
if(x==1) {x=0;led = _crol_(led,1);}

}
}