readwriteport.c

ATMEL AVR 单片机开发套件和大量C和ASM代码工程

#include <io8515.h> 
void main(void)
{
 unsigned char  achar;
 DDRB = 0xFF; 
 DDRD = 0x00; 
 PORTD= 0x00; 
 for(;;) 
    {
     achar = PIND; 
	 PORTB = achar; 
    }
}