STM32WBA62CGF6 datasheet(59/185 Pages) STMICROELECTRONICS

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DS14736 Rev 1

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STM32WBA6xxx

Functional overview

3.29

Real-time clock (RTC)

The real-time clock (RTC) is an independent BCD timer/counter. The RTC provides a time-

of-day clock/calendar with programmable alarm interrupts.

As long as the VDD 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 supports the following features:

•

Calendar with subsecond, seconds, minutes, hours (12 or 24 format), weekday, date,

month, year, in binary-coded decimal (BCD) format

•

Binary mode with 32-bit free-running counter

•

Automatic correction for 28, 29 (leap year), 30, and 31 days of the month

•

Two programmable alarms

•

On-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to

synchronize it with a reference clock

•

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

used to enhance the calendar precision

•

Digital calibration circuit with 0.95 ppm resolution, to compensate for quartz crystal

inaccuracy

•

Timestamp feature that can be used to save the calendar content. This function can be

triggered by an event on the timestamp pin, or by a tamper event

•

17-bit auto-reload wake-up timer (WUT) for periodic events with programmable

resolution and period

•

TrustZone support:

–

RTC fully securable

–

Alarm A, alarm B, wake-up timer and timestamp individual secure or nonsecure

configuration

–

Alarm A, alarm B, wake-up timer and timestamp individual privileged protection

The RTC is supplied from the VDD supply.

The RTC clock sources can be one of the following:

•

LSE, used as 32.768 kHz external crystal oscillator

•

LSE, with external resonator or oscillator

•

LSI, internal low-power RC oscillator (with typical frequency of 32 kHz)

•

HSE32, high-speed external clock divided by a prescaler in the RCC.

The RTC is functional in all low-power modes when it is clocked by the LSE or LSI.

All RTC events (alarm, wake-up timer, timestamp) can generate an interrupt and wake up

the device from the low-power modes.

3.30

Tamper and backup registers (TAMP)

The anti-tamper detection circuit is used to protect sensitive data from external attacks. 32

32-bit backup registers are retained in all low-power modes. The backup registers, as well

as other secrets in the device, are protected by this anti-tamper detection circuit with six

tamper pins and nine internal tampers. The external tamper pins can be configured for level

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