
541
32133D–11/2011
UC3D
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
RC Compare cannot be programmed to generate a trigger in this configuration.
At the same time, RC Compare can stop the counter clock (CMRn.CPCSTOP = 1) and/or dis-
able the counter clock (CMRn.CPCDIS = 1).
Figure 26-10. WAVSEL = 1 Without Trigger
Figure 26-11. WAVSEL = 1 With Trigger
Time
Counter Value
RC
RB
RA
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
RC
RB
RA
Counter incremented by trigger