STM32F373VC datasheet(23/131 Pages) STMICROELECTRONICS

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STM32F37xxx

Functional overview

3.17.3

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 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.

3.17.4

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 APB1 clock (PCLK1) derived from the main clock. It has an early warning

interrupt capability and the counter can be frozen in debug mode.

3.17.5

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 backup registers are supplied through a switch that takes power either

from VDD supply when present or through the VBAT pin. The backup registers are thirty two

32-bit registers used to store 128 bytes of user application data.

They are not reset by a system or power reset, and they are not reset when the device

wakes up from the Standby mode.

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