STM32F358XC datasheet(23/134 Pages) STMICROELECTRONICS

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STM32F358xC

Functional overview

3.17.4

Independent watchdog (IWDG)

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

clocked from an independent 40 kHz internal RC and as it operates independently from the

main clock, it can operate in Stop mode. 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.

3.17.5

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.

3.17.6

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

3.18

Real-time clock (RTC) and backup registers

The RTC and the 16 backup registers are supplied through VDD a switch that takes power

from either the VDD supply when present or the VBAT pin. The backup registers are sixteen

32-bit registers used to store 64 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. It supports the following features:

•

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

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

•

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

used to enhance the calendar precision.

•

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

•

Two programmable alarms with wake up from Stop mode capability.

•

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

synchronize it with a master clock.

•

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

inaccuracy.

•

Three 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.

STM32F358XC Datasheet(PDF) 23 Page - STMicroelectronics

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