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STM32U073R8I6 Datasheet(PDF) 70 Page - STMicroelectronics |
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STM32U073R8I6 Datasheet(HTML) 70 Page - STMicroelectronics |
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70 / 146 page  6.3.7 External clock source characteristics High-speed external user clock generated from an external source In bypass mode the HSE 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: I/O port characteristics. However, the recommended clock input waveform is shown in Figure 16. AC timing diagram for high-speed external clock source . Table 48. High-speed external user clock characteristics Specified by design, not tested in production. Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency Voltage scaling Range 1 - 8 48 MHz Voltage scaling Range 2 - 8 19 VHSEH OSC_IN input pin high level voltage - 0.7 VDDIOx - VDDIOx V VHSEL OSC_IN input pin low level voltage - VSS - 0.3 VDDIOx tw(HSEH) tw(HSEL) OSC_IN high or low time Voltage scaling Range 1 7 - - ns Voltage scaling Range 2 18 - - Figure 16. AC timing diagram for high-speed external clock source VHSEH 70% 30% THSE t VHSEL tw(HSEH) tw(HSEL) VHSE 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: I/O port characteristics. However, the recommended clock input waveform is shown in Figure 17. AC timing diagram for low-speed external clock source. Table 49. Low-speed external user clock characteristics Specified by design, not tested in production. 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 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 - 250 - - ns STM32U073x8/B/C Electrical characteristics DS14548 - Rev 2 page 70/146 |
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