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f7279c84bb
The INTFLAGS register is cleared by writing a 1 to the corresponding interrupt flag bit. From the samr21's manual: > Writing a zero to this bit has no effect. > Writing a one to this bit clears the Compare 0 interrupt flag. This is a common pattern in flag registers. This RTT driver is using or-equal to clear the flags, which means it can possibly clear other interrupts. There's a small chance that one event is missed if it happens very close to another event. Credits to @benpicco, @dylad for pointing out missing fixes.