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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN3029 데이터시트(PDF) 13 Page - STMicroelectronics |
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AN3029 데이터시트(HTML) 13 Page - STMicroelectronics |
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13 / 42 page  DocID16139 Rev 5 13/42 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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