#include <arduino.h>

byte intVar_OC4 = 61;

void timer4_ctc_init(void);




void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
Serial.println(F("HALLO"));
pinMode(13,OUTPUT);
digitalWrite(13,LOW);
delay(1000);
digitalWrite(13,HIGH);
delay(1000);
digitalWrite(13,LOW);
delay(1000);
digitalWrite(13,HIGH);


timer4_ctc_init();
 
}

void loop() {
  // put your main code here, to run repeatedly:
if (Serial.available()>0) intVar_OC4 =Serial.parseInt();
OCR4C= intVar_OC4;
Serial.println(intVar_OC4);
delay(500);  
}

void timer4_ctc_init(void) {

PLLCSR=(1<<PINDIV) | (1<<PLLE) | (0<<PLOCK);
PLLFRQ=(0<<PINMUX) | (1<<PLLUSB) | (0<<PLLTM1) | (1<<PLLTM0) | (1<<PDIV3) | (0<<PDIV2) | (1<<PDIV1) | (0<<PDIV0);

delayMicroseconds(100);

while ((PLLCSR & (1<<PLOCK))==0);

TCCR4A= (1<<COM4A0) ; // Toggle OC4A (PC7,PIN13) on Compare Match, normal Mode, kein PWM
TCCR4B= (1<<CS40);
TCCR4D= 0;
TCCR4E= 0;
OCR4A = 0;
OCR4C= intVar_OC4;
}