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Interrupt masks are enabled / disabled by setting or clearing bits in the Interrupt mask register (TIMSKx).
When an interrupt occurs, a flag in the interrupt flag register (TIFRx) is been set.
The Arduino board is based on the Atmel AVR ATmega168 or the ATmega328 microchip.
These chips are pin compatible and only differ in the size of internal memory.
This tutorial shows the use of timers and interrupts for Arduino boards.
As Arduino programmer you have probably used timers and interrupts without even knowing it’s there, because all the low level hardware stuff is hidden by the Arduino API.
You can configure the pre-scaler for the timer, or the mode of operation and many other things.
Many Arduino functions uses timers, for example the time functions: delay(), millis() and micros(), the PWM functions analog Write(), the tone() and the no Tone() function, even the Servo library uses timers and interrupts. counter is a piece of hardware built in the Arduino controller.
Buy the Arduino from: Banggood | Amazon A timer, A. It is like a clock, and can be used to measure time events.
The register and bit definitions can be found in the processor data sheet (Atmega328 or Atmega2560) and in the I/O definition header file (iomx8.h for Arduino, iomxx0_1.h for Arduino Mega in the hardware/tools/avr/include/avr folder).
The suffix x stands for the timer number (0..5), the suffix y stands for the output number (A, B, C), for example TIMSK1 (Timer1 interrupt mask register) or OCR2A (Timer2 output compare register A).