• 參數(shù)資料
      型號: MC9S12C32MFA25
      廠商: MOTOROLA INC
      元件分類: 微控制器/微處理器
      英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP48
      封裝: LQFP-48
      文件頁數(shù): 90/136頁
      文件大?。?/td> 2022K
      代理商: MC9S12C32MFA25
      Device User Guide — 9S12C128DGV1/D V01.05
      57
      2.3 Detailed Signal Descriptions
      2.3.1 EXTAL, XTAL — Oscillator Pins
      EXTAL and XTAL are the crystal driver and external clock pins. On reset all the device clocks are derived
      from the EXTAL input frequency. XTAL is the crystal output.
      2.3.2 RESET — External Reset Pin
      RESET is an active low bidirectional control signal that acts as an input to initialize the MCU to a known
      start-up state. It also acts as an open-drain output to indicate that an internal failure has been detected in
      either the clock monitor or COP watchdog circuit. External circuitry connected to the RESET pin should
      not include a large capacitance that would interfere with the ability of this signal to rise to a valid logic one
      within 32 ECLK cycles after the low drive is released. Upon detection of any reset, an internal circuit
      drives the RESET pin low and a clocked reset sequence controls when the MCU can begin normal
      processing.
      2.3.3 TEST / VPP — Test Pin
      This pin is reserved for test and must be tied to VSS in all applications.
      2.3.4 XFC — PLL Loop Filter Pin
      Dedicated pin used to create the PLL loop filter. See CRG BUG for more detailed information.PLL loop
      filter. Please ask your Motorola representative for the interactive application note to compute PLL loop
      filter elements. Any current leakage on this pin must be avoided.
      Figure 2-4 PLL Loop Filter Connections
      MCU
      XFC
      R0
      CS
      CP
      VDDPLL
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