Device: ATMega16, USB programmer ~ Avr910
Soft: IAR, Chipblaster AVR.
Incoming parameters: PINC.4 = led; (TQFP PIN#23)
PIND.0 = push button to ground (PIN#9)
VСС = +5V
Code:

#include "iom16.h" //тактовая частота 8Мгц
unsigned int i,j;
void main(void)
{
DDRA=255; //all - out
DDRB=224; //01234 - out
DDRC=240; //4567 - out
DDRD=240; //4567 - out
PORTA=0;
PORTB=0;
PORTC=0;
PORTD=0;


while(1)
{
PORTC=255;

if(!(PI1ND & (1 << PD0)))
{
for (i=1; i<1000; i++) {for (j=1; j<100; j++) {}}
if(!(PI1ND & (1 << PD0)))
{
PORTC=0;
for (i=1; i<1000; i++) {for (j=1; j<1000; j++) {}}
}
}

}} //while, main