/*****************************************************
CodeWizardAVR V1.25.9 Professional

Chip type           : ATtiny13
Clock frequency     : 1,000000 MHz
Memory model        : Tiny
External SRAM size  : 0
Data Stack size     : 16
*****************************************************/

#include <tiny13.h>
#include <delay.h>

unsigned int time_delay;

void main(void)
{

PORTB=0x00;
DDRB=0x10;
time_delay=500;

while (1)
    {
    for(time_delay = 1024; time_delay > 0;)
        {
        PORTB.4 = 1;
        delay_ms(time_delay);
        PORTB.4 = 0;
        delay_ms(time_delay);
        time_delay = time_delay/2;
        }
    };
}