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P912XDP512F0MFVR 数据表(PDF) 121 Page - Freescale Semiconductor, Inc |
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P912XDP512F0MFVR 数据表(HTML) 121 Page - Freescale Semiconductor, Inc |
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121 / 1350 page  Chapter 3 Pierce Oscillator (S12XOSCLCPV1) MC9S12XDP512 Data Sheet, Rev. 2.17 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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