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AN3342 数据表(PDF) 9 Page - STMicroelectronics |
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AN3342 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 39 page  AN3342 Clock management Doc ID 18461 Rev 3 9/39 3 Clock management The STM8TL5xxx has no external clock so no precautionary measures are needed. 3.1 Internal clocks STM8TL5xxx devices have three kinds of internal clock: A high speed internal clock (HSI) running at 16 MHz, a low speed internal clock (LSI) running at 38 kHz and a high speed internal clock dedicated to the ProxSense (HSI_PXS) running at 16 MHz. The HSI_PXS clock runs once the ProxSense is enabled if the LowPower bit is reset. If LowPower bit is set HSI_PXS clock runs only when an acquisition is being performed. After reset, the CPU starts at speed of 2 MHz driven by the internal RC (HSI clock signal) divided by 8. |
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