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STM32F215RGH7TR 查看數據表(PDF) - STMicroelectronics

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STM32F215RGH7TR Datasheet PDF : 173 Pages
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STM32F21xxx
Electrical characteristics
Figure 27. High-speed external clock source AC timing diagram
VHSEH
90%
10%
VHSEL
tr(HSE)
tf(HSE)
THSE
tW(HSE)
tW(HSE) t
External
clock source
fHSE_ext
OSC _IN
IL
STM32F
Figure 28. Low-speed external clock source AC timing diagram
ai17528
VLSEH
VLSEL
90%
10%
tr(LSE)
tf(LSE)
TLSE
tW(LSE)
tW(LSE) t
External
clock source
fLSE_ext
OSC32_IN
IL
STM32F
ai17529
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 27. 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).
Doc ID 17050 Rev 8
81/173

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