STM32F051T8H6 查看數據表（PDF） - STMicroelectronics

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STM32F051T8H6

ARM®-based 32-bit MCU, 16 to 64 KB Flash, 11 timers, ADC, DAC and communication interfaces, 2.0-3.6 V

STMicroelectronics 

Electrical characteristics

STM32F051x4 STM32F051x6 STM32F051x8

1. Guaranteed by design, not tested in production.

Figure 15. High-speed external clock source AC timing diagram

9+6(+

9+6(/





WU+6(

WZ+6(+

WI+6(

7+6(

WZ+6(/

W

069

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 6.3.14. However,

the recommended clock input waveform is shown in Figure 16.

Symbol

Table 34. Low-speed external user clock characteristics

Parameter(1)

Min

Typ

Max

fLSE_ext User external clock source frequency

VLSEH OSC32_IN input pin high level voltage

VLSEL OSC32_IN input pin low level voltage

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

1. Guaranteed by design, not tested in production.

-

0.7 VDDIOx

VSS

450

-

32.768

-

-

-

-

1000

VDDIOx

0.3 VDDIOx

-

50

Unit

kHz

V

ns

Figure 16. Low-speed external clock source AC timing diagram

9/6(+

9/6(/





WU/6(

WZ/6(+

WI/6(

7/6(

WZ/6(/

W

069

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DocID022265 Rev 7

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