STM32F328C8 datasheet(63/109 Pages) STMICROELECTRONICS

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STM32F328C8

Electrical characteristics

100

6.3.5

Wakeup time from low-power mode

The wakeup times given in 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 Stop and Sleep modes.

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

voltage conditions summarized in Table 18.

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 11.

Table 31. Low-power mode wakeup timings

Symbol

Parameter

Typ. @VDD = 1.8 V,

VDDA = 3.3 V

Max

Unit

tWUSTOP

Wakeup from Stop mode

4.5

µs

tWUPOR

Wakeup from power off

mode

74.4

103

tWUSLEEP

Wakeup from Sleep mode

CPU clock

cycles

Table 32. High-speed external user clock characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fHSE_ext

User external clock source

frequency(1)

1. Guaranteed by design, not tested in production.

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(1)

tr(HSE)

tf(HSE)

OSC_IN rise or fall time(1)

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