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STM32G0C1NET3 数据表(PDF) 83 Page - STMicroelectronics |
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STM32G0C1NET3 数据表(HTML) 83 Page - STMicroelectronics |
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83 / 159 page  DS13564 Rev 4 83/159 STM32G0C1xC/xE Electrical characteristics 124 Figure 18. High-speed external clock source AC timing diagram 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 19 for recommended clock input waveform. tw(HSEH) tw(HSEL) OSC_IN high or low time Voltage scaling Range 1 7- - ns Voltage scaling Range 2 18 - - 1. Guaranteed by design. Table 40. High-speed external user clock characteristics(1) (continued) Symbol Parameter Conditions Min Typ Max Unit MS19214V2 VHSEH tf(HSE) 90% 10% THSE t tr(HSE) VHSEL tw(HSEH) tw(HSEL) Table 41. 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. |
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