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| SAM7S256_14 Datasheet, PDF (457/775 Pages) ATMEL Corporation – ARM-based Flash MCU | |||
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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
Counter Value
0xFFFF
Counter cleared by compare match with 0xFFFF
RC
RB
RA
Waveform Examples
TIOB
Time
TIOA
Figure 33-8. WAVSEL= 00 with trigger
Counter Value
0xFFFF
RC
RB
RA
Waveform Examples
TIOB
Counter cleared by compare match with 0xFFFF
Counter cleared by trigger
Time
TIOA
SAM7S Series [DATASHEET]
6175MâATARMâ26-Oct-12
457
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