STM32WB15CC datasheet(42/127 Pages) STMICROELECTRONICS

42 / 127 page

Functional overview

STM32WB15CC

42/127

DS13258 Rev 4

3.18.4

Independent watchdog (IWDG)

The independent watchdog is based on a 12-bit downcounter and an 8-bit prescaler. It is

clocked from an independent 32 kHz internal RC (LSI) and as it operates independently

from the main clock, it can operate in Stop and Standby modes. It can be used either as a

watchdog to reset the device when a problem occurs, or as a free running timer for

application timeout management. It is hardware or software configurable through the option

bytes. The counter can be frozen in debug mode.

3.18.5

System window watchdog (WWDG)

The window watchdog is based on a 7-bit downcounter that can be set as free running. It

can be used as a watchdog to reset the device when a problem occurs. It is clocked from

the main clock. It has an early warning interrupt capability and the counter can be frozen in

debug mode.

3.18.6

SysTick timer

This timer is dedicated to real-time operating systems, but could also be used as a standard

down counter. It features:



a 24-bit down counter



autoreload capability



a maskable system interrupt generation when the counter reaches 0



a programmable clock source.

3.19

Real-time clock (RTC) and backup registers

The RTC is an independent BCD timer/counter, supporting the following features:



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

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



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 master 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.



One anti-tamper detection pin with programmable filter.



Timestamp feature, which 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, or by a switch to

VBAT mode.



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

resolution and period.

The RTC and the 20 backup registers are supplied through a switch that takes power either

from the VDD supply (when present) or from the VBAT pin.

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