STM32F051C8T6(2012) 查看數據表（PDF） - STMicroelectronics

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STM32F051C8T6
(Rev.:2012)

Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STMicroelectronics 

STM32F051x

Electrical characteristics

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 12.

Table 34. High-speed external user clock characteristics

Symbol

Parameter(1)

Conditions Min Typ Max Unit

fHSE_ext

User external clock source

frequency

VHSEH

VHSEL

tw(HSEH)

tw(HSEL)

tr(HSE)

tf(HSE)

OSC_IN input pin high level voltage

OSC_IN input pin low level voltage

OSC_IN high or low time

OSC_IN rise or fall time

1. Guaranteed by design, not tested in production.

1

8

32 MHz

0.7VDD -

VDD

V

VSS

- 0.3VDD

15

-

-

ns

-

-

20

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

6(3%(

6(3%,





TR(3%

T7(3%(

TF(3%

4(3%

T7(3%,

T

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Doc ID 022265 Rev 3

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