STM32L152RCY7 데이터 시트보기 (PDF) - STMicroelectronics

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STM32L152RCY7

Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3, 256KB Flash, 32KB SRAM, 8KB EEPROM, LCD, USB, ADC, DAC

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Electrical characteristics

STM32L151xC STM32L152xC

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 6.3.12. However, the

recommended clock input waveform is shown in Figure 15.

Table 27. High-speed external user clock characteristics(1)

Symbol

Parameter

Conditions

Min Typ Max Unit

fHSE_ext

User external clock source

frequency

CSS is on or

PLL is used

1

CSS is off, PLL

not used

0

8

32 MHz

8

32 MHz

VHSEH

VHSEL

OSC_IN input pin high level voltage

OSC_IN input pin low level voltage

0.7VDD -

VDD

V

VSS

- 0.3VDD

tw(HSEH)

tw(HSEL)

tr(HSE)

tf(HSE)

OSC_IN high or low time

OSC_IN rise or fall time

-

12

-

-

ns

-

-

20

Cin(HSE) OSC_IN input capacitance

-

2.6

-

pF

1. Guaranteed by design.

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

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DocID022799 Rev 13

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