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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PC912XDP512F0MPVR 데이터시트(PDF) 121 Page - Freescale Semiconductor, Inc |
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PC912XDP512F0MPVR 데이터시트(HTML) 121 Page - Freescale Semiconductor, Inc |
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121 / 1348 page  Chapter 3 Pierce Oscillator (S12XOSCLCPV1) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 121 EXTAL input frequency. In full stop mode (PSTP = 0), the EXTAL pin is pulled down by an internal resistor of typical 200 k Ω. NOTE Freescale recommends an evaluation of the application board and chosen resonator or crystal by the resonator or crystal supplier. Loop controlled circuit is not suited for overtone resonators and crystals. Figure 3-2. Loop Controlled Pierce Oscillator Connections (XCLKS = 1) NOTE Full swing Pierce circuit is not suited for overtone resonators and crystals without a careful component selection. Figure 3-3. Full Swing Pierce Oscillator Connections (XCLKS = 0) Figure 3-4. External Clock Connections (XCLKS = 0) MCU EXTAL XTAL VSSPLL Crystal or Ceramic Resonator C2 C1 * Rs can be zero (shorted) when use with higher frequency crystals. Refer to manufacturer’s data. MCU EXTAL XTAL RS* RB VSSPLL Crystal or Ceramic Resonator C2 C1 MCU EXTAL XTAL Not Connected CMOS Compatible External Oscillator (VDDPLL Level) |
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