STM32L4R9AI datasheet(36/306 Pages) STMICROELECTRONICS

36 / 306 page

Functional overview

STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

36/306

DocID030321 Rev 3

3.10.6

VBAT operation

The VBAT pin allows to power the device VBAT domain from an external battery, an external

supercapacitor, or from VDD when there is no external battery and when an external

supercapacitor is present. The VBAT pin supplies the RTC with LSE and the backup

registers. Three anti-tamper detection pins are available in VBAT mode.

The VBAT operation is automatically activated when VDD is not present. An internal VBAT

battery charging circuit is embedded and can be activated when VDD is present.

Note:

When the microcontroller is supplied from VBAT, neither external interrupts nor RTC

alarm/events exit the microcontroller from the VBAT operation.

3.11

Interconnect matrix

Several peripherals have direct connections between them, which allow autonomous

communication between them and support the saving of CPU resources (thus power supply

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

Depending on the peripherals, these interconnections can operate in Run, Sleep, Low-

power run and Sleep, Stop 0, Stop 1 and Stop 2 modes. See Table 6 for more details.

Table 6. STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

peripherals interconnect matrix

Interconnect source

Interconnect

destination

Interconnect action

TIMx

Timers synchronization or chaining

ADC

DACx

DFSDM1

Conversion triggers

DMA

Memory to memory transfer trigger

COMPx

Comparator output blanking

COMPx

TIM1, 8

TIM2, 3

Timer input channel, trigger, break from

analog signals comparison

LPTIMERx

Low-power timer triggered by analog

signals comparison

(1)

ADCx

TIM1, 8

Timer triggered by analog watchdog

RTC

TIM16

Timer input channel from RTC events

LPTIMERx

Low-power timer triggered by RTC alarms

or tampers

(1)

All clocks sources (internal

and external)

TIM2

TIM15, 16, 17

Clock source used as input channel for

RC measurement and trimming

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