Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

 647

SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

When WAVSEL = 01, the value of TC_CV is incremented from 0 to 0xFFFF. Once 0xFFFF is reached, the value of
TC_CV is decremented to 0, then re-incremented to 0xFFFF and so on. See 

A trigger such as an external event or a software trigger can modify TC_CV at any time. If a trigger occurs while
TC_CV is incrementing, TC_CV then decrements. If a trigger is received while TC_CV is decrementing, TC_CV
then increments. See 

RC Compare cannot be programmed to generate a trigger in this configuration. 

At the same time, RC Compare can stop the counter clock (CPCSTOP = 1) and/or disable the counter clock (CPC-
DIS = 1).

WAVSEL = 01 Without Trigger

WAVSEL = 01 With Trigger

Time

Counter Value

R

C

R

B

R

A

TIOB

TIOA

Counter decremented by compare match with 0xFFFF

0xFFFF

Waveform Examples

Time

Counter Value

TIOB

TIOA

Counter decremented by compare match with 0xFFFF

0xFFFF

Waveform Examples

Counter decremented 

by trigger

Counter incremented 

by trigger

R

C

R

B

R

A