CD00237391 datasheet(82/177 Pages) STMICROELECTRONICS

No. de pieza	CD00237391

Descripción Electrónicos	ARM-based 32-bit MCU, 150DMIPs, up to 1 MB Flash/1284KB RAM

PDF	177 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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82 / 177 page

Electrical characteristics

STM32F20xxx

82/177

Doc ID 15818 Rev 9

Figure 28.

High-speed external clock source AC timing diagram

Figure 29.

Low-speed external clock source AC timing diagram

High-speed external clock generated from a crystal/ceramic resonator

The high-speed external (HSE) clock can be supplied with a 4 to 26 MHz crystal/ceramic

resonator oscillator. All the information given in this paragraph are based on characterization

results obtained with typical external components specified in Table 28. In the application,

the resonator and the load capacitors have to be placed as close as possible to the oscillator

pins in order to minimize output distortion and startup stabilization time. Refer to the crystal

resonator manufacturer for more details on the resonator characteristics (frequency,

package, accuracy).

ai17528

OSC_IN

External

STM32F

clock source

VHSEH

tf(HSE)

tW(HSE)

90%

10%

THSE

tr(HSE)

tW(HSE)

fHSE_ext

VHSEL

ai17529

OSC32_IN

External

STM32F

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10%

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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