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STM8AP5X2ATAY 数据表(PDF) 67 Page - STMicroelectronics |
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STM8AP5X2ATAY 数据表(HTML) 67 Page - STMicroelectronics |
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67 / 100 page ![]() STM8AF61xx, STM8AF51xx Electrical characteristics 67/100 11.3.2 External clock sources and timing characteristics HSE user external clock Subject to general operating conditions for VDD and TA. Figure 17. HSE external clock source HSE crystal/ceramic resonator oscillator The HSE clock can be supplied using a crystal/ceramic resonator oscillator of up to 24 MHz. All the information given in this paragraph is based on characterization results with specified typical external components. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and start-up stabilization time. Refer to the crystal resonator manufacturer for more details (frequency, package, accuracy...). Table 24. HSE user external clock characteristics Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency TA < 105 °C 0(1) 1. In case of CSS, the external clock must have a frequency above 500 kHz. 24 MHz TA > 105 °C 0(1) 16 VHSEdHL Comparator hysteresis 0.1 x VDD V VHSEH OSCIN input pin high level voltage 0.7 x VDD VDD V VHSEL OSCIN input pin low level voltage VSS 0.3 x VDD ILEAK_HSE OSCIN input leakage current VSS < VIN < VDD -1 +1 µA OSCIN fHSE External clock STM8A source VHSEL VHSEH |
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