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型號(hào)：	S80C32-40SHXXX:RD
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, 40 MHz, MICROCONTROLLER, PQCC44
封裝：	PLASTIC, LCC-44
文件頁(yè)數(shù)：	761/1021頁(yè)
文件大?。?/td>	15196K

32072H–AVR32–10/2012

AT32UC3A3

Figure 28-13. WAVSEL = 3 With Trigger

External event/trigger conditions

An external event can be programmed to be detected on one of the clock sources (XC0, XC1,

XC2) or TIOB. The external event selected can then be used as a trigger.

The External Event Selection field in CMRn (CMRn.EEVT) selects the external trigger. The

External Event Edge Selection field in CMRn (CMRn.EEVTEDG) defines the trigger edge for

each of the possible external triggers (rising, falling or both). If CMRn.EEVTEDG is written to

zero, no external event is defined.

If TIOB is defined as an external event signal (CMRn.EEVT = 0), TIOB is no longer used as an

output and the compare register B is not used to generate waveforms and subsequently no

IRQs. In this case the TC channel can only generate a waveform on TIOA.

When an external event is defined, it can be used as a trigger by writing a one to the

CMRn.ENETRG bit.

As in Capture mode, the SYNC signal and the software trigger are also available as triggers. RC

Compare can also be used as a trigger depending on the CMRn.WAVSEL field.

Output controller

The output controller defines the output level changes on TIOA and TIOB following an event.

TIOB control is used only if TIOB is defined as output (not as an external event).

The following events control TIOA and TIOB:

software trigger

external event

RA compare controls TIOA and RB compare controls TIOB. Each of these events can be pro-

grammed to set, clear or toggle the output as defined in the following fields in CMRn:

RC Compare Effect on TIOB (CMRn.BCPC)

Counter Value

Counter decremented by compare match

Waveform Examples

Counter decremented by trigger

Counter incremented by trigger

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