STM32L4R9AI datasheet(36/307 Pages) STMICROELECTRONICS

36 / 307 page

Functional overview

STM32L4R5xx, STM32L4R7xx and STM32L4R9xx

36/307

DS12023 Rev 5

3.10.5

Reset mode

In order to improve the consumption under reset, the I/Os state under and after reset is

“analog state” (the I/O schmitt trigger is disable). In addition, the internal reset pull-up is

deactivated when the reset source is internal.

Independent

watchdog (IWDG)

OOO

O-

Window watchdog

(WWDG)

OOO

SysTick timer

Touch sensing

controller (TSC)

OOO

Random number

generator (RNG)

O(8)

CRC calculation

unit

OOO

GPIOs

OOO

(9)

pins

(10)

(11)

pins

(10)

1. Legend: Y = yes (enable). O = optional (disable by default, can be enabled by software). - = not available.

Gray cells highlight the wakeup capability in each mode.

2. The Flash can be configured in power-down mode. By default, it is not in power-down mode.

3. The SRAM clock can be gated on or off. In Stop 2 mode, the content of SRAM3 is preserved or not depending on the

RRSTP bit in PWR_CR1 register.

4. SRAM2 content is preserved when the bit RRS is set in PWR_CR3 register.

5. Some peripherals with wakeup from Stop capability can request HSI16 to be enabled. In this case, HSI16 is woken up by

the peripheral, and only feeds the peripheral which requested it. HSI16 is automatically put off when the peripheral does not

need it anymore.

6. UART and LPUART reception is functional in Stop mode, and generates a wakeup interrupt on Start, address match or

received frame event.

7. I2C address detection is functional in Stop mode, and generates a wakeup interrupt in case of address match.

8. Voltage scaling range 1 only.

9. I/Os can be configured with internal pull-up, pull-down or floating in Standby mode.

10. The I/Os with wakeup from standby/shutdown capability are: PA0, PC13, PE6, PA2, PC5.

11. I/Os can be configured with internal pull-up, pull-down or floating in Shutdown mode but the configuration is lost when

exiting the Shutdown mode.

Table 5. Functionalities depending on the working mode(1) (continued)

Peripheral

Run

Sleep

Low-

power

run

Low-

power

sleep

Stop 0/1

Stop 2

Standby Shutdown

VBAT

STM32L4R9AI Datasheet(PDF) 36 Page - STMicroelectronics

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