STM32F407IGT7 查看數據表（PDF） - STMicroelectronics

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STM32F407IGT7

ARM Cortex-M4 32b MCU+FPU, 210DMIPS, up to 1MB Flash/192+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 15 comm. interfaces & camera

STMicroelectronics 

STM32F405xx, STM32F407xx

Electrical characteristics

Figure 30. 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 31. 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 31. 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).

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