STM32F383RC datasheet(71/125 Pages) STMICROELECTRONICS

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STM32F383xx

Electrical characteristics

109

Low-speed external user clock generated from an external source

In bypass mode the LSE 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.

Figure 13. Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 32 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on design

simulation results obtained with typical external components specified in Table 37. In the

application, the resonator and the load capacitors have to be placed as close as possible to

the oscillator pins in order to minimize output distortion and startup stabilization time. Refer

to the crystal resonator manufacturer for more details on the resonator characteristics

(frequency, package, accuracy).

Table 36. Low-speed external user clock characteristics

Symbol

Parameter(1)

1. Guaranteed by design, not tested in production.

Conditions

Min

Typ

Max

Unit

fLSE_ext

User External clock source

frequency

32.768

1000

kHz

VLSEH

OSC32_IN input pin high level

voltage

0.7VDD

-VDD

VLSEL

OSC32_IN input pin low level

voltage

VSS

-0.3VDD

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

450

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

MS19215V2

VLSEH

tf(LSE)

90%

10%

TLSE

tr(LSE)

VLSEL

tW(LSEH)

tW(LSEL)

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