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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT49CV7 датащи(PDF) 31 Page - Holtek Semiconductor Inc |
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HT49CV7 датащи(HTML) 31 Page - Holtek Semiconductor Inc |
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31 / 48 page  The following table shows the C1, C2 and R1 values corresponding to the different crystal values. (For refer- ence only) Crystal or Resonator C1, C2 R1 4MHz Crystal 0pF 10k W 4MHz Resonator 10pF 12k W 3.58MHz Crystal 0pF 10k W 3.58MHz Resonator 25pF 10k W 2MHz Crystal & Resonator 25pF 10k W 1MHz Crystal 35pF 27k W 480kHz Resonator 300pF 9.1k W 455kHz Resonator 300pF 10k W 429kHz Resonator 300pF 10k W The function of the resistor R1 is to ensure that the oscillator will switch off should low voltage conditions occur. Such a low voltage, as mentioned here, is one which is less than the lowest value of the MCU oper- ating voltage. Note however that if the LVR is enabled then R1 can be removed. HT49RV7/HT49CV7 Rev. 1.00 31 April 20, 2006 |
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