STM32C011D4U6 datasheet(52/94 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32C011x4/x6

52/94

DS13866 Rev 3

5.3.7

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 5.3.13. See

Figure 12 for recommended clock input waveform.

Figure 12. High-speed external clock source AC timing diagram

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 5.3.13. See

Figure 13 for recommended clock input waveform.

Table 36. High-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

MHz

VHSEH

Digital OSC_IN input pin high

level voltage

0.7 VDD

-VDD

VHSEL

Digital OSC_IN input pin low

level voltage

-VSS

0.3 VDD

tw(HSEH)/

tw(HSEL)

Digital OSC_IN high or low time

1. Specified by design – Not tested in production.

MS19214V2

VHSEH

tf(HSE)

90%

10%

THSE

tr(HSE)

VHSEL

tw(HSEH)

tw(HSEL)

Table 37. Low-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext User external clock source frequency

32.768

1000

kHz

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