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STM8AF6366ITD Folha de dados(PDF) 58 Page - STMicroelectronics |
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STM8AF6366ITD Folha de dados(HTML) 58 Page - STMicroelectronics |
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58 / 95 page  Electrical characteristics STM8AF6366 58/95 DS12343 Rev 2 Figure 16. HSE external clock source HSE crystal/ceramic resonator oscillator The HSE clock can be supplied using a crystal/ceramic resonator oscillator of up to 16 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 startup stabilization time. Refer to the crystal resonator manufacturer for more details (frequency, package, accuracy...). V HSEH V HSEL External clock source OSCIN fHSE STM8 MS36489V1 Table 29. HSE oscillator characteristics Symbol Parameter Conditions Min Typ Max Unit RF Feedback resistor - - 220 - k Ω CL1/CL2(1) Recommended load capacitance - - - 20 pF gm Oscillator transconductance - 5 - - mA/V tSU(HSE)(2) Startup time VDD is stabilized -2.8 - ms 1. The oscillator needs two load capacitors, CL1 and CL2, to act as load for the crystal. The total load capacitance (Cload) is (CL1 * CL2)/(CL1 + CL2). If CL1 = CL2, Cload = CL1 / 2. Some oscillators have built-in load capacitors, CL1 and CL2. 2. This value is the startup time, measured from the moment it is enabled (by software) until a stabilized 16 MHz oscillation is reached. It can vary with the crystal type that is used. |
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