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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F030C6 датащи(PDF) 53 Page - STMicroelectronics |
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STM32F030C6 датащи(HTML) 53 Page - STMicroelectronics |
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53 / 93 page  DS9773 Rev 4 53/93 STM32F030x4/x6/x8/xC Electrical characteristics 75 Low-speed external user clock generated from an external source In bypass mode the LSE 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 6.3.14. However, the recommended clock input waveform is shown in Figure 16. Figure 16. 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 32 MHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on design simulation results obtained with typical external components specified in Table 33. 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 32. Low-speed external user clock characteristics Symbol Parameter(1) 1. Guaranteed by design, not tested in production. Min Typ Max Unit fLSE_ext User external clock source frequency - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage 0.7 VDDIOx -VDDIOx V VLSEL OSC32_IN input pin low level voltage VSS - 0.3 VDDIOx tw(LSEH) tw(LSEL) OSC32_IN high or low time 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time - - 50 Table 33. HSE oscillator characteristics Symbol Parameter Conditions(1) Min(2) Typ Max(2) Unit fOSC_IN Oscillator frequency - 4 8 32 MHz RF Feedback resistor - - 200 - k Ω MS19215V2 VLSEH tf(LSE) 90% 10% TLSE t tr(LSE) VLSEL tw(LSEH) tw(LSEL) |
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