Not able to set OCR1BH on Uno

Projects Programming
1

I've tried to set OCR1BH using OCR1B or OCR1BH but when I read them back they are always wrong.

I did notice that if I write ICR1 with data in ICR1H and put data in OCR1L. OCR1H reads back with the data of ICR1H.

Im using Uno on 1.8.5

void setup() {
  Serial.begin(9600);
  while (!Serial) {}

  ICR1   = 6500;
  OCR1B  = 6250;
  //OCR1BH = 24;
  //OCR1BL = 106;

  Serial.print( "ICR1   = ");
  Serial.println(ICR1, DEC);
  
  Serial.print( "ICR1L  = ");
  Serial.println(ICR1L, DEC);
  
  Serial.print( "ICR1H  = ");
  Serial.println(ICR1H, DEC);
  
  Serial.print( "OCR1B  = ");
  Serial.println(OCR1B, DEC);
  
  Serial.print( "OCR1BL = ");
  Serial.println(OCR1BL, DEC);
  
  Serial.print( "OCR1BH = ");
  Serial.println(OCR1BH, HEX);

}

I get the following outputs setting the registers different ways. OCR1B and OCR1BH always read wrong.

// ICR1   = 6500;
// OCR1B  = 6250;
ICR1   = 6500
ICR1L  = 100
ICR1H  = 25
OCR1B  = 106
OCR1BL = 106
OCR1BH = 0

// ICR1   = 6500;
// OCR1BH = 24;
// OCR1BL = 106;
ICR1   = 6500
ICR1L  = 100
ICR1H  = 25
OCR1B  = 106
OCR1BL = 106
OCR1BH = 0

// ICR1   = 6500;
// OCR1BL = 106;
ICR1   = 6500
ICR1L  = 100
ICR1H  = 25
OCR1B  = 6506
OCR1BL = 106
OCR1BH = 25

Does anyone have any ideas as to why I'm not able to set OCR1BH correctly?

3

Hmm it looks like I was following how they were doing the C Code Example for setting OCR1B and ICR1 in the first output. Though ICR1 was correct in setting the upper 8-bits while OCR1B wasn't.