22.5.3 Event Control

Name: EVCTRL
Offset: 0x04
Reset: 0x00
Property: -

Bit 76543210 
  FILTER EDGE   CAPTEI 
Access R/WR/WR/W 
Reset 000 

Bit 6 – FILTER Input Capture Noise Cancellation Filter

Writing this bit to '1' enables the input capture noise cancellation unit.

Bit 4 – EDGE Event Edge

This bit is used to select the event edge. The effect of this bit is dependent on the selected Count Mode (CNTMODE) in TCBn.CTRLB. "-" means that an event or edge has no effect in this mode.

Count Mode EDGE Positive Edge Negative Edge
Periodic Interrupt mode 0 - -
1 - -
Timeout Check mode 0 Start counter Stop counter
1 Stop counter Start counter
Input Capture on Event mode 0 Input Capture, interrupt -
1 - Input Capture, interrupt
Input Capture Frequency Measurement mode 0 Input Capture, clear and restart counter, interrupt -
1 - Input Capture, clear and restart counter, interrupt
Input Capture Pulse-Width Measurement mode 0 Clear and restart counter Input Capture, interrupt
1 Input Capture, interrupt Clear and restart counter
Input Capture Frequency and Pulse Width Measurement mode 0

On 1st Positive: Clear and restart counter

On following Negative: Input Capture

2nd Positive: Stop counter, interrupt

1

On 1st Negative: Clear and restart counter

On following Positive: Input Capture

2nd Negative: Stop counter, interrupt

Single-Shot mode 0 Start counter -
1 Start counter Start counter
8-Bit PWM mode 0 - -
1 - -

Bit 0 – CAPTEI Capture Event Input Enable

Writing this bit to '1' enables the input capture event.