STM32F030CC(2015) 查看數據表（PDF） - STMicroelectronics

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STM32F030CC
(Rev.:2015)

Value-line ARM®-based 32-bit MCU with up to 256-KB Flash, timers, ADC, communication interfaces, 2.4-3.6 V operation

STMicroelectronics 

Electrical characteristics

STM32F030x4/6/8/C

6.3.7

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 6.3.14. However,

the recommended clock input waveform is shown in Figure 14: High-speed external clock

source AC timing diagram.

Symbol

Table 31. High-speed external user clock characteristics

Parameter(1)

Min

Typ

Max

fHSE_ext User external clock source frequency

1

8

32

VHSEH OSC_IN input pin high level voltage

0.7 VDDIOx

-

VDDIOx

VHSEL OSC_IN input pin low level voltage

VSS

-

0.3 VDDIOx

tw(HSEH)

tw(HSEL)

OSC_IN high or low time

15

-

-

tr(HSE)

tf(HSE)

OSC_IN rise or fall time

-

-

20

1. Guaranteed by design, not tested in production.

Unit

MHz

V

ns

Figure 14. High-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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