Datasheet

21.4 Signal Description
Table 21-1. Signal Description
Signal Description Type
INn [n=0..4] Tamper Detection Input Digital input
OUT Tamper Detection Output Digital output
One signal can be mapped to one of several pins.
Related Links
6. I/O Multiplexing and Considerations
21.5 Product Dependencies
In order to use this peripheral, other parts of the system must be configured correctly, as described below.
21.5.1 I/O Lines
For more information on I/O configurations, refer to the "RTC Pinout" section.
Related Links: I/O Multiplexing and Considerations
21.5.2 Power Management
The RTC will continue to operate in any sleep mode where the selected source clock is running. The RTC
interrupts can be used to wake up the device from sleep modes. Events connected to the event system
can trigger other operations in the system without exiting sleep modes. Refer to the Power Manager for
details on the different sleep modes.
The RTC will be reset only at power-on (POR) or by setting the Software Reset bit in the Control A
register (CTRLA.SWRST=1).
Related Links
18. PM – Power Manager
21.5.3 Clocks
The RTC bus clock (CLK_RTC_APB) can be enabled and disabled in the Main Clock module MCLK, and
the default state of CLK_RTC_APB can be found in Peripheral Clock Masking section.
A 32KHz or 1KHz oscillator clock (CLK_RTC_OSC) is required to clock the RTC. This clock must be
configured and enabled in the 32KHz oscillator controller (OSC32KCTRL) before using the RTC.
This oscillator clock is asynchronous to the bus clock (CLK_RTC_APB). Due to this asynchronicity,
writing to certain registers will require synchronization between the clock domains. Refer to 21.6.7
Synchronization for further details.
Related Links
29. OSC32KCTRL – 32KHz Oscillators Controller
15.6.2.6 Peripheral Clock Masking
21.5.4 DMA
The DMA request lines (or line if only one request) are connected to the DMA Controller (DMAC). Using
the RTC DMA requests requires the DMA Controller to be configured first.
SAM D5x/E5x Family Data Sheet
RTC – Real-Time Counter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 285