Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
380
tamper detection circuitry. If RTCOUTx is not used, the RTC must be configured to create an internal sampling
point for the debouncer logic. The period of time between two samples can be configured by programming the
TPERIOD field in RTC_MR.
point for the debouncer logic. The period of time between two samples can be configured by programming the
TPERIOD field in RTC_MR.
illustrates the use of WKUPx without the RTCOUTx pin.
Figure 19-7.
Using WKUP Pins Without RTCOUTx Pins
19.4.7.4 Clock Alarms
The RTC and the RTT alarms can generate a wake-up of the core power supply. This can be enabled by writing,
respectively, the bits RTCEN and RTTEN to 1 in SUPC_WUMR.
respectively, the bits RTCEN and RTTEN to 1 in SUPC_WUMR.
The Supply Controller does not provide any status as the information is available in the user interface of either the
Real-Time Timer or the Real-Time Clock.
Real-Time Timer or the Real-Time Clock.
19.4.7.5 Supply Monitor Detection
The supply monitor can generate a wake-up of the core power supply. See
19.4.8 Register Write Protection
To prevent any single software error from corrupting SYSC behavior, certain registers in the address space can be
write-protected by setting the WPEN bit in the
write-protected by setting the WPEN bit in the
(SYSC_WPMR).
The following registers can be write-protected:
RSTC Mode Register
RTT Mode Register
RTT Alarm Register
RTC Control Register
RTC Mode Register
RTC Time Alarm Register
RTC Calendar Alarm Register
General Purpose Backup Registers
MCU
WKUP0
WKUP1
VDDIO
Pull-up
Resistor
Resistor
Pull-up
Resistor
Resistor
GND
GND
GND