Datasheet

Related Links
22. DMAC – Direct Memory Access Controller
21.5.5 Interrupts
The interrupt request line is connected to the Interrupt Controller. Using the RTC interrupt requires the
Interrupt Controller to be configured first.
Related Links
10.2 Nested Vector Interrupt Controller
21.5.6 Events
The events are connected to the Event System.
Related Links
31. EVSYS – Event System
21.5.7 Debug Operation
When the CPU is halted in debug mode the RTC will halt normal operation. The RTC can be forced to
continue operation during debugging. Refer to 21.8.7 DBGCTRL for details.
21.5.8 Register Access Protection
All registers with write-access are optionally write-protected by the peripheral access controller (PAC),
except the following registers:
• Interrupt Flag Status and Clear (INTFLAG) register
Write-protection is denoted by the "PAC Write-Protection" property in the register description.
Write-protection does not apply to accesses through an external debugger. Refer to the PAC - Peripheral
Access Controller for details.
Related Links
27. PAC - Peripheral Access Controller
21.5.9 Analog Connections
A 32.768kHz crystal can be connected to the XIN32 and XOUT32 pins, along with any required load
capacitors. See the Electrical Characteristics Chapters for details on recommended crystal characteristics
and load capacitors.
21.6 Functional Description
21.6.1 Principle of Operation
The RTC keeps track of time in the system and enables periodic events, as well as interrupts and events
at a specified time. The RTC consists of a 10-bit prescaler that feeds a 32-bit counter. The actual format
of the 32-bit counter depends on the RTC operating mode.
The RTC can function in one of these modes:
• Mode 0 - COUNT32: RTC serves as 32-bit counter
• Mode 1 - COUNT16: RTC serves as 16-bit counter
• Mode 2 - CLOCK: RTC serves as clock/calendar with alarm functionality
SAM D5x/E5x Family Data Sheet
RTC – Real-Time Counter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 286