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STM32G47PBY3TR データシート(PDF) 114 Page - STMicroelectronics |
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STM32G47PBY3TR データシート(HTML) 114 Page - STMicroelectronics |
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114 / 229 page ![]() Electrical characteristics STM32G473xB STM32G473xC STM32G473xE 114/229 DS12712 Rev 3 Figure 19. 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. However, the recommended clock input waveform is shown in Figure 20. Figure 20. Low-speed external clock source AC timing diagram Table 40. Low-speed external user clock characteristics(1) 1. Guaranteed by design. 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 VDD -VDD V VLSEL OSC32_IN input pin low level voltage -VSS -0.3 VDD tw(LSEH) tw(LSEL) OSC32_IN high or low time - 250 - - ns MS19214V2 VHSEH tf(HSE) 90% 10% THSE t tr(HSE) VHSEL tw(HSEH) tw(HSEL) MS19215V2 VLSEH tf(LSE) 90% 10% TLSE t tr(LSE) VLSEL tw(LSEH) tw(LSEL) |
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