Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Fiche De Données

880

Atmel | SMART SAM D21 [DATASHEET]

Atmel-42181C–SAM-D21_Datasheet–07/2014

During sleep modes, filtering is supported only for single-shot measurements. Filtering must be disabled if continuous 
measurements will be done during sleep modes, or the resulting interrupt/event may be generated incorrectly.

The output of each comparator can be routed to an I/O pin by setting the Output bit group in the Comparator Control x 
register (COMPCTRLx.OUT). This allows the comparator to be used by external circuitry. Either the raw, non-
synchronized output of the comparator or the CLK_AC-synchronized version, including filtering, can be used as the I/O 
signal source. The output appears on the corresponding CMP[x] pin.

The Swap bit in the Comparator Control registers (COMPCTRLx.SWAP) controls switching of the input signals to a 
comparator's positive and negative terminals. When the comparator terminals are swapped, the output signal from the 
comparator is also inverted, as shown in 

. This allows the user to measure or compensate for the comparator 

input offset voltage. As part of the input selection, COMPCTRLx.SWAP can be changed only while the comparator is 
disabled.

Sampling Clock

Sampled

Comparator Output

3-bit Majority

Filter Output

5-bit Majority

Filter Output

Sampling Clock

3-bit Sampled

Comparator Output

3-bit Majority

Filter Output

Start

5-bit Sampled

Comparator Output

5-bit Majority

Filter Output

t

SUT

MUXPOS

MUXNEG

COMPx

SWAP

ENABLE

HYSTERESIS

SWAP

CMPx

COMPCTRLx