In the docs and manuals and examples we always find the OCR1A register assigned after TCCR1A as shown below (set up timer 1 for CTC WGM mode '4'). But if, like me, you're new to the system and happen to put the OCR1A assignment before TCCR1A ... (as shown) then your UNO will suck the life out of y…

A warning! FYI, UNO, a timer 1 trap to be avoided

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