#define PORTB_DATARG         0x25
#define PORTB_DDRBRG        0x24
#define PORTB_PINBRG         0x23
#define DT                  10000000U
#define DATARG          (*(volatile uint8_t*)(PORTB_DATARG))
#define DDRBRG          (*(volatile uint8_t*)(PORTB_DDRBRG))
#define PINBRG          (*(volatile uint8_t*)(PORTB_PINBRG))

void setup() {
  // put your setup code here, to run once:
    DDRBRG |=(1<<5);  // using as output
   
}

void loop() {
  // put your main code here, to run repeatedly:
 DATARG =0b00100000;
 myDelay();
 DATARG =0b00000000;;
 myDelay();
}


void myDelay()
{

for(volatile uint32_t i=0;i<DT;i++);
}