STM32F372VB datasheet(70/128 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F37x

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6.3.6

Wakeup time from low-power mode

The wakeup times given in Table 37 are measured from the wakeup event trigger to the first

instruction executed by the CPU. The clock source used to wake up the device depends

from the current operating mode:

●

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 22.

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 12.

Table 37.

Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ @VDD = VDDA

Max

Unit

= 2.0 V = 2.4 V = 2.7 V

= 3 V

= 3.3 V

tWUSTOP

Wakeup from Stop

mode

Regulator in run mode

4.1

3.9

3.8

3.7

3.6

4.5

µs

Regulator in low

power mode

7.9

6.7

6.1

5.7

5.4

8.6

tWUSTANDBY

Wakeup from

Standby mode

LSI and IWDG off

62.6

53.7

49.2

45.7

42.7

100

tWUSLEEP

Wakeup from Sleep

mode

After WFE instruction

CPU

clock

cycles

Table 38.

High-speed external user clock characteristics

Symbol

Parameter(1)

Guaranteed by design, not tested in production.

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

MHz

VHSEH

OSC_IN input pin high level voltage

0.7VDD

VDD

VHSEL

OSC_IN input pin low level voltage

VSS

0.3VDD

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

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