STM32F378VC datasheet(71/131 Pages) STMICROELECTRONICS

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STM32F378xx

Electrical characteristics

110

6.3.6

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 6.3.13. However,

the recommended clock input waveform is shown in Figure 13.

Table 35. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ

@VDD = 1.8 V,

VDDA = 3.3 V

Max

Unit

tWUSTOP

Wakeup from Stop mode

3.6

5.21

µs

tWUSLEEP

Wakeup from Sleep mode

After WFE instruction

CPU

clock

cycles

tWUPOR

Wakeup from Power off state

Startup after NPOR

pin release

62.6

100

µs

Table 36. High-speed external user clock characteristics

Symbol

Parameter(1)

1. Guaranteed by design.

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

CSS is on or

PLL is used

832

MHz

CSS is off,

PLL not used

VHSEH OSC_IN input pin high level voltage

0.7 VDD

-VDD

VHSEL OSC_IN input pin low level voltage

VSS

-0.3 VDD

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

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