STM32F334X4 datasheet(63/115 Pages) STMICROELECTRONICS

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STM32F334x4 STM32F334x6 STM32F334x8

Electrical characteristics

100

6.3.6

Wakeup time from low-power mode

The wakeup times given in Table 34 are measured starting from the wakeup event trigger up

to the first instruction executed by the CPU:

•

For Stop or Sleep mode: the wakeup event is WFE.

•

WKUP1 (PA0) pin is used to wakeup from Standby, Stop and Sleep modes.

All timings are derived from tests performed under ambient temperature and VDD supply

voltage conditions summarized in Table 19.

6.3.7

External clock source characteristics

High-speed external user clock generated from an external source

In bypass mode the HSE oscillator is switched off and the input pin is a standard GPIO. The

external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the

recommended clock input waveform is shown in Figure 13.

Table 34. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ. @VDD, VDD = VDDA

Max.

Unit

2.0 V

2.4 V

2.7 V

3 V

3.3 V

3.6 V

tWUSTOP

Wakeup from

Stop mode

Regulator in

run mode

4.3

4.1

4.0

3.9

3.8

3.7

4.5

µs

Regulator in

low-power

mode

7.8

6.7

6.1

5.9

5.5

5.3

tWUSTANDBY(1)

Wakeup from

Standby mode

LSI and

IWDG OFF

74.4

64.3

60.0

56.9

54.3

51.1

103

tWUSLEEP

Wakeup from

Sleep mode

-6

CPU

clock

cycles

1. Data based on characterization results, not tested in production.

Table 35. Wakeup time using USART

Symbol

Parameter

Conditions

Typ

Max

Unit

tWUUSART

Wakeup time needed to

calculate the maximum

USART baudrate allowing

to wakeup up from stop

mode when USART clock

source is HSI

Stop mode with

main regulator in

low power mode

-13.125

µs

Stop mode with

main regulator in

run mode

3.125

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