Situation: You want to include a timer interrupt service routine in an assembly language program for an AVR-based Arduino. The program will be written, assembled and uploaded using the Arduino IDE.

to sample the Pulse Sensor with consistent and regular timing. The code is setup to read Pulse Sensor signal at 500Hz (every 2mS). Pulse Sensor Arduino UNO uses Timer2 by default. Use of Timer2 ...

The Arduino can wake up using an external reset, an external level interrupt on INT, pin change interrupt, timer interrupt, SPM/EEPROM ready interrupt, brown-out reset, watchdog interrupt, watchdog ...