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STM32MP157A 数据表(PDF) 148 Page - STMicroelectronics |
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STM32MP157A 数据表(HTML) 148 Page - STMicroelectronics |
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148 / 259 page  Electrical characteristics STM32MP157A/D 148/259 DS12504 Rev 5 6.3.8 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 I/O. Digital and analog bypass modes are available. The external clock signal has to respect the Table 52: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 15 for digital bypass mode and in Figure 16 for analog bypass mode. In analog bypass mode the clock can be a sinusoidal waveform. Figure 15. High-speed external clock source AC timing diagram (digital bypass) Table 29. High-speed external user clock characteristics (digital bypass)(1) 1. Guaranteed by design. Symbol Parameter Min Typ Max Unit fHSE_ext User external clock source frequency 8 24 48 MHz VSW (VHSEH -VHSEL) OSC_IN amplitude 0.7×VDD -VDD V VDC OSC_IN input voltage VSS -0.3×VSS tW(HSE) OSC_IN high or low time 7 - - ns Table 30. High-speed external user clock characteristics (analog bypass)(1) Symbol Parameter Min Typ Max Unit fHSE_ext User external clock source frequency 8 24 48 MHz duty cycle (Square wave) 45 50 55 % duty cycle deterioration 0 ±10(2) ±20(3) % VHSE Absolute input range 0 - VDD - ai17528b OSC_IN External STM32 clock source VHSEH tf(HSE) tW(HSE) IL 90 % 10 % THSE t tr(HSE) tW(HSE) fHSE_ext VHSEL |
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