Minimum Event Duration Must Exceed the Selected Clock Period

Event detection will fail if TCBn receives an input event with a high/low period shorter than the period of the selected clock source (CLKSEL in TCBn.CTRLA). This applies to the TCB modes (CNTMODE in TCBn.CTRLB) Time-Out Check and Input Capture Frequency and Pulse-Width Measurement mode.

Work around

Ensure that the high/low period of input events is equal to or longer than the period of the selected clock source (CLKSEL in TCBn.CTRLA).

Affected Silicon Revisions

ATtiny214/ATtiny414
Rev. A Rev. B            
X X            
ATtiny814
Rev. A Rev. B            
X X            
Parent topic: TCB - Timer/Counter B