STM32L552CCT3PTR datasheet(47/340 Pages) STMICROELECTRONICS

47 / 340 page

DS12737 Rev 6

47/340

STM32L552xx

Functional overview

3.9.6

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.

3.9.7

VBAT operation

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

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

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.

4. 4 Kbytes or full SRAM2 content is preserved depending on RRS[1:0] bits configuration 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 ranges 0 and 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 11. 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

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