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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32G030C8 датащи(PDF) 51 Page - STMicroelectronics |
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STM32G030C8 датащи(HTML) 51 Page - STMicroelectronics |
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51 / 94 page  DS12991 Rev 4 51/94 STM32G030x6/x8 Electrical characteristics 79 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 5.3.14. See Figure 13 for recommended clock input waveform. Figure 13. 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 48 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 36. 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 35. Low-speed external user clock characteristics(1) Symbol Parameter Conditions 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 VDDIO1 -VDDIO1 V VLSEL OSC32_IN input pin low level voltage - VSS - 0.3 VDDIO1 tw(LSEH) tw(LSEL) OSC32_IN high or low time - 250 - - ns 1. Guaranteed by design. MS19215V2 VLSEH tf(LSE) 90% 10% TLSE t tr(LSE) VLSEL tw(LSEH) tw(LSEL) Table 36. HSE oscillator characteristics(1) Symbol Parameter Conditions(2) Min Typ Max Unit fOSC_IN Oscillator frequency - 4 8 48 MHz RF Feedback resistor - - 200 - kΩ |
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