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STM8S103F3M3 bảng dữ liệu(PDF) 67 Page - STMicroelectronics |
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STM8S103F3M3 bảng dữ liệu(HTML) 67 Page - STMicroelectronics |
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67 / 117 page  (1) C is approximately equivalent to 2 x crystal Cload. (2) The oscillator selection can be optimized in terms of supply current using a high quality resonator with small Rm value. Refer to crystal manufacturer for more details (3) Data based on characterization results, not tested in production. (4) t SU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 16 MHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal manufacturer. Figure 19: HSE oscillator circuit diagram OSCOUT OSCIN f HSE to core CL1 CL2 RF STM8 Resonator Consumption control gm Rm Cm Lm CO Resonator HSE oscillator critical g m equation gmcrit= (2 × Π × fHSE) 2 × R m(2Co + C) 2 Rm: Notional resistance (see crystal specification) Lm: Notional inductance (see crystal specification) Cm: Notional capacitance (see crystal specification) Co: Shunt capacitance (see crystal specification) CL1= CL2 = C: Grounded external capacitance gm >> gmcrit Internal clock sources and timing characteristics 10.3.4 Subject to general operating conditions for VDD and TA. High speed internal RC oscillator (HSI) Table 34: HSI oscillator characteristics Unit Max Typ Min Conditions Parameter Symbol MHz - 16 - Frequency fHSI 67/117 DocID15441 Rev 9 Electrical characteristics STM8S103K3 STM8S103F3 STM8S103F2 |
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