STM32L471RG datasheet(119/218 Pages) STMICROELECTRONICS

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STM32L471xx

Electrical characteristics

199

6.3.6

Wakeup time from low-power modes and voltage scaling

transition times

The wakeup times given in Table 41 are the latency between the event and the execution of

the first user instruction.

The device goes in low-power mode after the WFE (Wait For Event) instruction.

1. The BusMatrix is automatically active when at least one master is ON (CPU, DMA).

2. The GPIOx (x= A…H) dynamic current consumption is approximately divided by a factor two versus this table values when

the GPIO port is locked thanks to LCKK and LCKy bits in the GPIOx_LCKR register. In order to save the full GPIOx current

consumption, the GPIOx clock should be disabled in the RCC when all port I/Os are used in alternate function or analog

mode (clock is only required to read or write into GPIO registers, and is not used in AF or analog modes).

3. The AHB to APB1 Bridge is automatically active when at least one peripheral is ON on the APB1.

4. The AHB to APB2 Bridge is automatically active when at least one peripheral is ON on the APB2.

Table 41. Low-power mode wakeup timings(1)

Symbol

Parameter

Conditions

Typ Max

Unit

tWUSLEEP

Wakeup time from Sleep

mode to Run mode

-6

Nb of

CPU

cycles

tWULPSLEEP

Wakeup time from Low-

power sleep mode to Low-

power run mode

Wakeup in Flash with Flash in power-down during

low-power sleep mode (SLEEP_PD=1 in

FLASH_ACR) and with clock MSI = 2 MHz

69.3

tWUSTOP0

Wake up time from Stop 0

mode to Run mode in Flash

Range 1

Wakeup clock MSI = 48 MHz

5.6

10.9

µs

Wakeup clock HSI16 = 16 MHz 4.7

10.4

Range 2

Wakeup clock MSI = 24 MHz

5.7

11.1

Wakeup clock HSI16 = 16 MHz 4.5

10.5

Wakeup clock MSI = 4 MHz

6.6

14.2

Wake up time from Stop 0

mode to Run mode in

SRAM1

Range 1

Wakeup clock MSI = 48 MHz

0.7

2.05

Wakeup clock HSI16 = 16 MHz 1.7

2.8

Range 2

Wakeup clock MSI = 24 MHz

0.8

2.72

Wakeup clock HSI16 = 16 MHz 1.7

2.8

Wakeup clock MSI = 4 MHz

2.4 11.32

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