Datasheet

542
32133D–11/2011
UC3D
26.6.3.5 WAVSEL = 3
When CMRn.WAVSEL is three, the value of CVn is incremented from zero to RC. Once RC is
reached, the value of CVn is decremented to zero, then re-incremented to RC and so on. See
Figure 26-12 on page 542.
A trigger such as an external event or a software trigger can modify CVn at any time. If a trigger
occurs while CVn is incrementing, CVn then decrements. If a trigger is received while CVn is
decrementing, CVn then increments. See Figure 26-13 on page 543.
RC Compare can stop the counter clock (CMRn.CPCSTOP = 1) and/or disable the counter clock
(CMRn.CPCDIS = 1).
Figure 26-12. WAVSEL = 3 Without Trigger
Time
Counter Value
RC
RB
RA
TIOB
TIOA
Counter cleared by compare match with RC
0xFFFF
Waveform Examples