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AN3029 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Getting started with STM8L and STM8AL
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AN3029 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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AN3029
Clock management
41
Figure 6. Crystal/ceramic resonators
1. To avoid exceeding the maximum value of CL1 and CL2 (15 pF), it is strongly recommended to use a
resonator with a load capacitance CL = 7 pF. To fine-tune the choice, refer to the gmcrit calculation in
AN2867 (Oscillator design guide for ST microcontrollers).
2. OSC32_IN and OSC32_OUT pins can be used also as GPIO, but it is recommended not to use them as
both RTC and GPIO pins in the same application.
3. The value of REXT depends on the crystal characteristics. A 0 Ω resistor works with most oscillators. A
typical value is in the range 5 to 6 RS. To fine-tune the REXT value refer to AN2867 (Oscillator design guide
for ST microcontrollers).
OSC32_OUT
OSC32_IN
ai15764
CL1
CL2
Microcontroller
REXT
(3)



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