STM32G030C8 datasheet(17/94 Pages) STMICROELECTRONICS

17 / 94 page

DS12991 Rev 4

17/94

STM32G030x6/x8

Functional overview

3.7.6

VBAT operation

The VBAT power domain, consuming very little energy, includes RTC, and LSE oscillator and

backup registers.

In VBAT mode, the RTC domain is supplied from VBAT pin. The power source can be, for

example, an external battery or an external supercapacitor. Two anti-tamper detection pins

are available.

The RTC domain can also be supplied from VDD/VDDA pin.

By means of a built-in switch, an internal voltage supervisor allows automatic switching of

RTC domain powering between VDD and voltage from VBAT pin to ensure that the supply

voltage of the RTC domain (VBAT) remains within valid operating conditions. If both voltages

are valid, the RTC domain is supplied from VDD/VDDA pin.

An internal circuit for charging the battery on VBAT pin can be activated if the VDD voltage is

within a valid range.

Note:

External interrupts and RTC alarm/events cannot cause the microcontroller to exit the VBAT

mode, as in that mode the VDD is not within a valid range.

3.8

Interconnect of peripherals

Several peripherals have direct connections between them. This allows autonomous

communication between peripherals, saving CPU resources thus power supply

consumption. In addition, these hardware connections allow fast and predictable latency.

Depending on peripherals, these interconnections can operate in Run, Sleep and Stop

modes.

Table 4. Interconnect of peripherals

Interconnect source

Interconnect

destination

Interconnect action

TIMx

Timer synchronization or chaining

ADCx

Conversion triggers

DMA

Memory-to-memory transfer trigger

ADCx

TIM1

Timer triggered by analog watchdog

RTC

TIM16

Timer input channel from RTC events

All clock sources (internal and

external)

TIM14,16,17

Clock source used as input channel for

RC measurement and trimming

CSS

RAM (parity error)

Flash memory (ECC error)

TIM1,16,17

Timer break

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