Datasheet

 2017 Microchip Technology Inc. DS60001516A-page 545
SAM9G20
33.5.11.3 WAVSEL = 01
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 Figure 33-11.
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 Figure 33-12.
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 (CPCDIS = 1).
Figure 33-11: WAVSEL = 01 Without Trigger
Figure 33-12: 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