STM32G0 datasheet(30/135 Pages) STMICROELECTRONICS

30 / 135 page

Functional overview

STM32G071x8/xB

30/135

DS12232 Rev 4

Features of LPTIM1 and LPTIM2:

•

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: LSE, LSI, HSI16 or APB clocks

–

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

used by pulse counter application)

•

Programmable digital glitch filter

•

Encoder mode

3.18.5

Independent watchdog (IWDG)

The independent watchdog is based on an 8-bit prescaler and 12-bit downcounter with

user-defined refresh window. It is clocked from an independent 32 kHz internal RC (LSI).

Independent of 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. Its counter can be frozen in debug mode.

3.18.6

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 by the

system clock. It has an early-warning interrupt capability. Its counter can be frozen in debug

mode.

3.18.7

SysTick timer

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

down counter.

Features of SysTick timer:

•

24-bit down counter

•

Autoreload capability

•

Maskable system interrupt generation when the counter reaches 0

•

Programmable clock source

3.19

Real-time clock (RTC), tamper (TAMP) and backup registers

The device embeds an RTC and five 32-bit backup registers, located in the RTC domain of

the silicon die.

The ways of powering the RTC domain are described in Section 3.7.6.

The RTC is an independent BCD timer/counter.

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