![]() ![]() This flag can be checked manually, or you can have the timer trigger an interrupt as soon as the flag is set. The timer normally sets a flag bit to let you know an overflow has occurred. The timer increments this counter one step at a time until it reaches its maximum value, at which point the counter overflows, and resets back to zero. The counter register can count to a certain value, depending on its size (usually 8 bits or 16 bits). Timers work by incrementing a counter variable known as a counter register. The LED will blink perfectly on time, regardless of what your main program was just doing How do timers work? With a timer interrupt, you can set up the interrupt, then turn on the timer. If you are not using timers but just conventional code techniques, you’d have to set a variable with the next time the LED should blink, then check constantly to see if that time had arrived. So suppose you have a device that needs to do something –like blink an LED every 5 seconds. Rather than running a loop or repeatedly calling millis(), you can let a timer do that work for you while your code does other things. Timers, like external interrupts, run independently from your main program. ![]() When that point arrives, that alert interrupts the microprocessor, reminding it to do something, like run a specific piece of code. Like in real life, in microcontrollers a timer is something you set to trigger an alert at a certain point in the future. This article will discuss AVR and Arduino timers and how to use them in Arduino projects or custom AVR circuits. ![]()
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