STM32F100RC datasheet(51/106 Pages) STMICROELECTRONICS

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STM32F100xC, STM32F100xD, STM32F100xE

Electrical characteristics

105

Figure 11. High-speed external clock source AC timing diagram

Figure 12. 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 24 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 22. 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).

Table 22. HSE 4-24 MHz oscillator characteristics(1)(2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC_IN Oscillator frequency

MHz

Feedback resistor

200

ai14140c

OSC32_IN

External

STM32F10xxx

clock source

VLSEH

tf(LSE)

tW(LSE)

90%

10%

TLSE

tr(LSE)

tW(LSE)

fLSE_ext

VLSEL

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