Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet

42023E–SAM–07/2013

Figure 37-2. Analog Comparator Interface in Window mode

When operating in window mode, each AC generates the same ACOUT outputs as in normal
mode, see 

.

Additionally, the ACIFC generates a window mode signal (ACWOUT) according to the common
input voltage to be compared:

• ACWOUT = 1 if the common input voltage is inside the window, V

ACBNx+1

 < V

common

 < V

ACAPx

• ACWOUT = 0 if the common input voltage is outside the window, V

common

 < V

ACANx+1

 or 

V

common

 > V

ACAPx

• ACWOUT = 0 if the window mode output is not available (SR.ACRDYx=0 or 

SR.ACRDYx+1=0)

The Windowx Mode Current Status bit in SR (SR.WFCSx) gives the comparison status of the
window pair.

When operating in window mode, each AC can generate the same interrupt as in normal mode,
see 

Additionally, when ACs operate in window mode, a third type of interrupt based on ACWOUT
can be generated (bit ISR.WFINTx).

Writing to Window Mode Interrupt Settings in Windowx Mode Configuration Register (CON-
FWx.WIS) selects an interrupt source:

• As soon as the common input voltage is inside the window.

• As soon as the common input voltage is outside the window.

Comparator pair

-

+

ACx

Interrupt 

Generator

Window 

Module

ACOUTx

Peripheral Event 

Generator 

Window

WINDOW MODE 

PERIPHERAL 

EVENT

-

+

ACx+1

SR
.A

CC

Sn

SR
.W
FCS

n

ACAPx

ACANx

ACBPx

COMMON

ACWOUT

ACBNx

IRQ

ACOUTx+1

CONFx.INSELN

CONFx+1.INSELN