Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet

42023E–SAM–07/2013

• Startup time interrupt (bit ISR.SUTINTx), each AC can generate an interrupt when the 

startup time is over.

• AC output based interrupt (bit ISR.ACINTx). In normal mode, the following interrupt sources 

are available:

– When V

INP

 > V

INN

– When V

INP

 < V

INN

– On toggle of the AC output (ACOUT)

– When comparison has been done

The user selects the interrupt source by writing to the Interrupt Settings field in the ACx Configu-
ration Register (CONFx.IS). 

The ACIFC can generate peripheral events according to the configuration of CONFx.EVENN
and CONFx.EVENP.

• When V

INP

 > V

INN

 or 

• When V

INP

 < V

INN

Window mode is enabled by writing a one to the Window Mode Enable bit in the Window Config-
uration Register (CONFWx.WFEN). Two ACs, ACx and ACx

+1

, (an even and the following odd

build up a pair) are grouped if window mode is enabled by writing CONFWx.WFEN.

The sources of the negative input of ACx (even) and the positive input of ACx

+1

 (odd) must be

connected together externally. The Negative Input Select field in the ACx Configuration Register
(CONFx.INSELN) must select the corresponding external input pin (ACANx) as the source to the
negative input of ACx. The negative input of ACx+1 can still be selected independently by
CONFx+1.INSELN.