Datasheet

Figure 23-11. Using WKUP Pins Without RTCOUTx Pins
MCU
WKUP0
WKUP1
VDDIO
Pull-up
Resistor
Pull-up
Resistor
GND
GND
GND
Related Links
27. Real-time Clock (R
TC)
23.4.9.3 Clock Alarms
The RTC and the RTT alarms can generate a wakeup of the core power supply. This can be enabled by setting,
respectively, SUPC_WUMR.RTCEN and SUPC_WUMR.RTTEN.
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.
23.4.9.4 Supply Monitor Detection
The supply monitor can generate a wakeup of the core power supply. See "Supply Monitor".
23.4.10 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 ”System Controller Write Protection Mode Register” (SYSC_WPMR).
The following registers can be write-protected:
• RSTC Mode Register
(1)
• RTT Mode Register
(2)
• RTT Alarm Register
(2)
• RTC Control Register
(3)
• RTC Mode Register
(3)
• RTC Time Alarm Register
(3)
• RTC Calendar Alarm Register
(3)
• General Purpose Backup Registers
(4)
• Supply Controller Control Register
• Supply Controller Supply Monitor Mode Register
• Supply Controller Mode Register
• Supply Controller Wakeup Mode Register
• Supply Controller Wakeup Inputs Register
SAM E70/S70/V70/V71 Family
Supply Controller (SUPC)
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echnology Inc.
Datasheet
DS60001527D-page 163