Datasheet

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• When the channel is counting events from the Event System, write a '1' to the TC Event Input Invert

Enable bit in Event Control register (EVCTRL.TCINV).

Figure 48-11. Capture Double Buffering

"capture"

COUNT

CCBx

CCx

"INT/DMA

request"

data read

For input capture, the buffer register and the corresponding CCx act like a FIFO. When CCx is empty or

read, any content in CCBUFx is transferred to CCx. The buffer valid flag is passed to set the CCx

interrupt flag (IF) and generate the optional interrupt, event or DMA request. The CCBUFx register value

can't be read, all captured data must be read from CCx register.

Note:

When up-counting (CTRLBSET.DIR=0), counter values lower than 1 cannot be captured. To capture the

full range including value 0, the TC must be in down-counting mode (CTRLBSET.DIR=0).

48.6.2.8.1 Event Capture Action

The compare/capture channels can be used as input capture channels to capture events from the Event

System and give them a timestamp. The following figure shows four capture events for one capture

channel.

Figure 48-12. Input Capture Timing

events

COUNT

TOP

ZERO

Capture 0 Capture 1 Capture 2 Capture 3

The TC can detect capture overflow of the input capture channels: When a new capture event is detected

while the Capture Interrupt flag (INTFLAG.MCx) is still set, the new timestamp will not be stored and

INTFLAG.ERR will be set.

SAM D5x/E5x Family Data Sheet

TC – Timer/Counter

Datasheet

DS60001507E-page 1723