Datasheet

34.5.5 Interrupts
The interrupt request lines are connected to the interrupt controller. Using the AC interrupts requires the
interrupt controller to be configured first. Refer to Nested Vector Interrupt Controller for details.
Related Links
11.2 Nested Vector Interrupt Controller
34.5.6 Events
The events are connected to the Event System. Refer to EVSYS – Event System for details on how to
configure the Event System.
Related Links
24. EVSYS – Event System
34.5.7 Debug Operation
When the CPU is halted in Debug mode, this peripheral will continue normal operation. If the peripheral is
configured to require periodical service by the CPU through interrupts or similar, improper operation or
data loss may result during debugging. This peripheral can be forced to halt operation during debugging.
34.5.8 Register Access Protection
All registers with write-access can be write-protected optionally by the Peripheral Access Controller
(PAC), except for the following registers:
• Control B register (CTRLB)
• Interrupt Flag register (INTFLAG)
Optional write-protection by the Peripheral Access Controller (PAC) is denoted by the "PAC Write-
Protection" property in each individual register description.
PAC write-protection does not apply to accesses through an external debugger.
Related Links
11.6 PAC - Peripheral Access Controller
34.5.9 Analog Connections
Each comparator has up to four I/O pins that can be used as analog inputs. Each pair of comparators
shares the same four pins. These pins must be configured for analog operation before using them as
comparator inputs.
Any internal reference source, such as a bandgap voltage reference, or DAC must be configured and
enabled prior to its use as a comparator input.
34.6 Functional Description
34.6.1 Principle of Operation
Each comparator has one positive input and one negative input. Each positive input may be chosen from
a selection of analog input pins. Each negative input may be chosen from a selection of both analog input
pins and internal inputs, such as a bandgap voltage reference.
The digital output from the comparator is '1' when the difference between the positive and the negative
input voltage is positive, and '0' otherwise.
SAM D21 Family
AC – Analog Comparators
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 933