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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F412RGH3TR датащи(PDF) 107 Page - STMicroelectronics |
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STM32F412RGH3TR датащи(HTML) 107 Page - STMicroelectronics |
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107 / 201 page  DocID028087 Rev 7 107/201 STM32F412xE/G Electrical characteristics 166 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. The external clock signal has to respect the Table 57. However, the recommended clock input waveform is shown in Figure 27. The characteristics given in Table 39 result from tests performed using an high-speed external clock source, and under ambient temperature and supply voltage conditions summarized in Table 16. Table 39. High-speed external user clock characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE_ext External user clock source frequency(1) 1- 50 MHz VHSEH OSC_IN input pin high level voltage 0.7VDD -VDD V VHSEL OSC_IN input pin low level voltage VSS -0.3VDD tw(HSE) tw(HSE) OSC_IN high or low time(1) 1. Guaranteed by design, not tested in production. 5- - ns tr(HSE) tf(HSE) OSC_IN rise or fall time(1) -- 10 Cin(HSE) OSC_IN input capacitance(1) -5 - pF DuCy(HSE) Duty cycle 45 - 55 % IL OSC_IN Input leakage current VSS ≤VIN ≤VDD -- ±1 µA |
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