STM32L552CCT3PTR datasheet(70/340 Pages) STMICROELECTRONICS

70 / 340 page

Functional overview

STM32L552xx

70/340

DS12737 Rev 6

This low-power timer supports the following features:

•

16-bit up counter with 16-bit autoreload register

•

16-bit compare register

•

Configurable output: pulse, PWM

•

Continuous/ one shot mode

•

Selectable software/hardware input trigger

•

Selectable clock source

–

Internal clock sources: LSE, LSI, HSI16 or APB clock

–

External clock source over LPTIM input (working even with no internal clock

source running, used by pulse counter application).

•

Programmable digital glitch filter

•

Encoder mode (LPTIM1 only).

3.30.5

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.

3.30.6

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.

3.30.7

SysTick timer

The Cortex®-M33 with TrustZone embeds two SysTick timers.

When TrustZone is activated, two SysTick timer are available:

•

SysTick, Secure instance.

•

SysTick, Non-secure instance.

When TrustZone is disabled, only one SysTick timer is available.

This timer (secure or non-secure) 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

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