STM32F058C8 datasheet(22/104 Pages) STMICROELECTRONICS

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Functional overview

STM32F058C8 STM32F058R8 STM32F058T8

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DocID023402 Rev 3

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.

3.14.5

System window watchdog (WWDG)

The system 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 APB clock (PCLK). It has an early warning interrupt capability and the

counter can be frozen in debug mode.

3.14.6

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

•

maskable system interrupt generation when the counter reaches 0

•

programmable clock source (HCLK or HCLK/8)

3.15

Real-time clock (RTC) and backup registers

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

on VDD supply when present or through the VBAT pin. The backup registers are five 32-bit

registers used to store 20 bytes of user application data when VDD power is not present.

They are not reset by a system or power reset.

The RTC is an independent BCD timer/counter. Its main features are the following:

•

calendar with subseconds, 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 day of the month

•

programmable alarm with wake up from Stop mode capability

•

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

synchronize the RTC with a master clock

•

digital calibration circuit with 1 ppm resolution, to compensate for quartz crystal

inaccuracy

•

two anti-tamper detection pins with programmable filter. The MCU can be woken up

from Stop mode on tamper event detection

•

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. The MCU can be

woken up from Stop mode on timestamp event detection

•

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

used to enhance the calendar precision

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