源代码：
/*
* _3.c
*
* Created: 2011-4-5 11:34:29
* Author: xmphoenix.fish
*/
#include <avr/io.h>
#include<util/delay.h>
#define F_CPU 8000000UL
const unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char buff[3]={0,0,0};
int main(void)
{
unsigned char i,data;
DDRB = 0x00;PORTB = 0xFF;
DDRF = 0xff;PORTF = 0x00;
DDRE = 0xff;PORTE = 0x00;
while(1)
{
data = PINB;
buff[0] = data/100;
buff[1] = data/10%10;
buff[2] = data%10;
for (i=0;i<3;i++)
{
PORTE = ~_BV(i+1);//关键的两句表达式
PORTF = table[buff[i]];
_delay_ms(10);
}
}
}
截图：
