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Programming timing loops in AVR assembler

Beginners in AVR assembler programming very often start by blinking a LED on a port pin. This "Hello World" of the AVR universe already is a complicated task, because it is not just setting a constant to an appropriate number of milliseconds and call a timer to wait for that time (as you might solve it on a high-level language on a PC. In assembler it requires a basic understanding of how and how fast the controller executes instructions. The necessary knowledge for such delay loops and their exact calculation is described here.


  1. 8 bit register time loop
  2. 16 bit double register time loop
  3. 24 bit triple register time loop

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