Datasheet

 2017 Microchip Technology Inc. DS60001516A-page 543
SAM9G20
33.5.11.1 WAVSEL = 00
When WAVSEL = 00, the value of TC_CV is incremented from 0 to 0xFFFF. Once 0xFFFF has been reached, the value of TC_CV is reset.
Incrementation of TC_CV starts again and the cycle continues. See Figure 33-7.
An external event trigger or a software trigger can reset the value of TC_CV. It is important to note that the trigger may occur at any time.
See Figure 33-8.
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 in TC_CMR) and/or disable the counter clock (CPCDIS = 1 in TC_CMR).
Figure 33-7: WAVSEL = 00 without trigger
Figure 33-8: WAVSEL = 00 with trigger
Time
Counter Value
R
C
R
B
R
A
TIOB
TIOA
Counter cleared by compare match with 0xFFFF
0xFFFF
Waveform Examples
Time
Counter Value
R
C
R
B
R
A
TIOB
TIOA
Counter cleared by compare match with 0xFFFF
0xFFFF
Waveform Examples
Counter cleared by trigger