In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

The code in the interrupt runs every 10 microseconds "in the background". Think of it is a separate program that runs at very precise intervals, over and over. All it does, really, is count "up".

The "main" program occasionally reads this count to see how much time has passed, and to reset the counter to zero. The rest is keeping track of what's going on, and making some decisions.

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