How to make a pulse width of 1us at 100Hz

Projects General Guidance
1

hello.
I am trying to make a 100Hz frequency with a pulse width of 1us using an Arduino Uno (Atmega328p / 16MHz).

void setup() {

pinMode(9,OUTPUT);
noInterrupts();
  TCNT1=0x0000;

  // WGM : 14(1110b), none-inverted mode
  TCCR1A = bit(COM1A1)|bit(COM1B1);
  TCCR1A |=bit(WGM11);
  TCCR1B = bit(WGM13)|bit(WGM12); 

 //prescailing : clock/8
  TCCR1B|=bit(CS11);

 //TOP
  ICR1 = 20000-1;

//duty cycle
  OCR1A= 1;
interrupts();  
 }

After coding like this, when I measured it with an oscilloscope, it was an intermittent output, not a periodic signal. This is not a continuous 100Hz output.
I measured it by increasing the duty cycle and it worked fine.

I'm not sure which one is the problem. Please help me.

2

Use CTC mode (12) for pulse generation.

3

it was an intermittent output, not a periodic signal.

The code you posted works fine for me, and produces a 100 Hz PWM signal with 1 us ON time. Sounds like you have intermittent connections to the scope.

4

Or, you have your scope triggering options set incorrectly...

5

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