STM32MP157F datasheet(51/260 Pages) STMICROELECTRONICS

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DS12505 Rev 5

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STM32MP157C/F

Functional overview

As long as the supply voltage remains in the operating range, the RTC never stops,

regardless of the device status (Run mode, Low-power mode or under reset).

The RTC unit main features are the following:

•

Calendar with subseconds, seconds, minutes, hours (12 or 24 format), day (day of

week), date (day of month), month, and year.

•

Daylight saving compensation programmable by software.

•

Programmable alarm with interrupt function. The alarm can be triggered by any

combination of the calendar fields.

•

Automatic wakeup unit generating a periodic flag that triggers an automatic wakeup

interrupt.

•

Reference clock detection: a more precise second source clock (50 or 60 Hz) can be

used to enhance the calendar precision.

•

Accurate synchronization with an external clock using the subsecond shift feature.

•

Digital calibration circuit (periodic counter correction): 0.95 ppm accuracy, obtained in a

calibration window of several seconds

•

Timestamp function for event saving

•

Maskable interrupts/events:

–Alarm A

–Alarm B

–

Wakeup interrupt

–Timestamp

•

TrustZone support:

–

RTC fully securable

–

Alarm A, alarm B, wakeup timer and timestamp individual secure or non-secure

configuration

3.38

Tamper and backup registers (TAMP)

32 x 32-bit backup registers are retained in all low-power modes and also in VBAT mode.

They can be used to store sensitive data as their content is protected by an tamper

detection circuit. 3 tamper pins and 5 internal tampers are available for anti-tamper

detection. The external tamper pins can be configured for edge detection, edge and level,

level detection with filtering, or active tamper which increases the security level by auto

checking that the tamper pins are not externally opened or shorted.

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