Datasheet

• Event Control register (EVCTRL)
Enable-protection is denoted by the "Enable-Protected" property in each individual register description.
46.6.2.2 Enabling, Disabling and Resetting
The AC is enabled by writing a '1' to the Enable bit in the Control A register (CTRLA.ENABLE). The AC is
disabled writing a '0' to CTRLA.ENABLE.
The AC is reset by writing a '1' to the Software Reset bit in the Control A register (CTRLA.SWRST). All
registers in the AC will be reset to their initial state, and the AC will be disabled. Refer to CTRLA for
details.
46.6.2.3 Comparator Configuration
Each individual comparator must be configured by its respective Comparator Control register
(COMPCTRLx) before that comparator is enabled. These settings cannot be changed while the
comparator is enabled.
• Select the desired measurement mode with COMPCTRLx.SINGLE. See Starting a Comparison for
more details.
• Select the desired hysteresis with COMPCTRLx.HYSTEN and COMPCTRLx.HYST. See Input
Hysteresis for more details.
• Write COMPCTRLx.SPEED to 0x3.
• Select the interrupt source with COMPCTRLx.INTSEL.
• Select the positive and negative input sources with the COMPCTRLx.MUXPOS and
COMPCTRLx.MUXNEG bits. See Selecting Comparator Inputs for more details.
• Select the filtering option with COMPCTRLx.FLEN.
• Select standby operation with Run in Standby bit (COMPCTRLx.RUNSTDBY).
The individual comparators are enabled by writing a '1' to the Enable bit in the Comparator x Control
registers (COMPCTRLx.ENABLE). The individual comparators are disabled by writing a '0' to
COMPCTRLx.ENABLE. Writing a '0' to CTRLA.ENABLE will also disable all the comparators, but will not
clear their COMPCTRLx.ENABLE bits.
46.6.2.4 Starting a Comparison
Each comparator channel can be in one of two different measurement modes, determined by the Single
bit in the Comparator x Control register (COMPCTRLx.SINGLE):
• Continuous measurement
• Single-shot
After being enabled, a start-up delay is required before the result of the comparison is ready. This start-up
time is measured automatically to account for environmental changes, such as temperature or voltage
supply level, and is specified in the Electrical Characteristics chapters. During the start-up time, the
COMP output is not available.
The comparator can be configured to generate interrupts when the output toggles, when the output
changes from '0' to '1' (rising edge), when the output changes from '1' to '0' (falling edge) or at the end of
the comparison. An end-of-comparison interrupt can be used with the Single-Shot mode to chain further
events in the system, regardless of the state of the comparator outputs. The Interrupt mode is set by the
Interrupt Selection bit group in the Comparator Control register (COMPCTRLx.INTSEL). Events are
generated using the comparator output state, regardless of whether the interrupt is enabled or not.
SAM D5x/E5x Family Data Sheet
AC – Analog Comparators
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1644