2.1 Timers_Capture_Mode

Now, what if I wanted the timer to work like a stopwatch? To record the time it takes to do a process or to note down the time when an event occurs. For this, we need to use the timer in Capture mode. What we learned above was using the timer in Compare mode where we compare the timer value with the value in the CCRn register.
The Capture Mode is selected when CAP = 1. The capture inputs CCIxA and CCIxB are connected to external pins or internal signals and are selected with the CCIS bits. The CM bits select the capture edge of the input signal as rising, falling, or both. A capture occurs on the selected edge of the input signal. If a capture occurs:
• The timer value is copied into the TAxCCRn register
• The interrupt flag CCIFG is set

https://i.imgur.com/ZmYHtfm.jpg

Overflow logic is provided in each capture/compare register to indicate if a second capture was performed before the value from the first capture was read.Bit COV is set when this occurs.

Output modes

Registers needed

Interrupt vector

code