Timer and Interrupts

What is the purpose of the attachInterrupt() function?

• To enable interrupts on pin changes

• To attach a timer to a pin

• To disable interrupts

• To read pin values

Which timer is used by the Servo library on Arduino Uno?

• Timer0

• Timer1

• Timer3

• Timer2

What is the maximum value before overflow for a 16-bit timer?

• 1023

• 255

• 65535

• 32767

What does the Timer Overflow interrupt indicate?

• The timer is started

• The timer is paused

• The timer has been reset

• The timer has reached its limit value

What is the prescaler used for in timers?

• To increase the timer frequency

• To decrease the timer frequency

• To reset the timer

• To stop the timer

What is the purpose of the TCNTx register?

• To enable timer overflow

• To control timer interrupts

• To configure the prescaler

• To store the actual timer value

How do you enable a timer overflow interrupt?

• Clear the TOV bit in TIFRx

• Set the TOV bit in TIFRx

• Clear the TOIE bit in TIMSKx

• Set the TOIE bit in TIMSKx

What is the frequency of Timer1 when using a prescaler of 256 with a CPU frequency of 16 MHz?

• 16000000 Hz

• 62500 Hz

• 15625 Hz

• 250000 Hz

What should be done to achieve a precise interrupt time of 1 second?

• Preload TCNT1 with a specific value

• Increase the CPU frequency

• Set TCNT1 to 0

• Disable interrupts

What does the ISR(TIMER1_OVF_vect) function do?

• Stops the timer

• Toggles the state of a pin

• Resets the timer

• Preloads the timer with a new value