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STM8S005C6T6 Datasheet(PDF) 68 Page - STMicroelectronics |
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STM8S005C6T6 Datasheet(HTML) 68 Page - STMicroelectronics |
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68 / 103 page ![]() (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 18: 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 9.3.4 Subject to general operating conditions for VDD and TA. High speed internal RC oscillator (HSI) Table 32: HSI oscillator characteristics Unit Max Typ Min Conditions Parameter Symbol MHz 16 Frequency fHSI DocID022186 Rev 3 68/103 STM8S005K6 STM8S005C6 Electrical characteristics |
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