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      參數(shù)資料
      型號(hào): MQ80C154-36P883
      廠商: ATMEL CORP
      元件分類: 微控制器/微處理器
      英文描述: 8-BIT, 36 MHz, MICROCONTROLLER, CQFP44
      封裝: CERAMIC, QFP-44
      文件頁數(shù): 21/91頁
      文件大?。?/td> 19688K
      代理商: MQ80C154-36P883
      32
      7707F–AVR–11/10
      AT90USB82/162
      Notes:
      1. These options should only be used when not operating close to the maximum frequency of the
      device, and only if frequency stability at start-up is not important for the application. These
      options are not suitable for crystals.
      2. These options are intended for use with ceramic resonators and will ensure frequency stability
      at start-up. They can also be used with crystals when not operating close to the maximum fre-
      quency of the device, and if frequency stability at start-up is not important for the application.
      Note:
      1.
      The device is shipped with this option selected.
      6.5
      Calibrated Internal RC Oscillator
      The calibrated internal RC Oscillator by default provides a 8.0 MHz clock. The fre-
      quency is nominal value at 3.0V and 25°C. At 3.0V and 25°C, this calibration gives a
      frequency of 8 MHz ± 10%. The device is shipped with the CKDIV8 Fuse programmed.
      See “System Clock Prescaler” on page 34 for more details. This clock may be selected
      as the system clock by programming the CKSEL Fuses as shown in Table 6-6. If
      selected, it will operate with no external components. During reset, hardware loads the
      calibration byte into the OSCCAL Register and thereby automatically calibrates the RC
      Oscillator. At 3.3V and 25
      C, this calibration gives a frequency of 8 MHz ± 1%. The
      oscillator can be calibrated to any frequency in the range 7.3 - 8.1 MHz within ±1%
      accuracy, by changing the OSCCAL register. When this Oscillator is used as the chip
      clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the
      Reset Time-out. For more information on the pre-programmed calibration value, see the
      Notes:
      1. The device is shipped with this option selected.
      2. The frequency ranges are preliminary values. Actual values are TBD.
      Crystal Oscillator, BOD
      enabled
      16K CK
      14CK
      1
      01
      Crystal Oscillator, fast
      rising power
      16K CK
      14CK + 4.1 ms
      1
      10
      Crystal Oscillator, slowly
      rising power
      16K CK
      14CK + 65 ms
      1
      11
      Table 6-5.
      Start-up times for the internal calibrated RC Oscillator clock selection
      Power Conditions
      Start-up Time from Power-
      down and Power-save
      Additional Delay from
      Reset (VCC = 5.0V)
      SUT1..0
      BOD enabled
      6 CK
      14CK
      00
      Fast rising power
      6 CK
      14CK + 4.1 ms
      01
      Slowly rising power
      6 CK
      14CK + 65 ms(1)
      10
      Reserved
      11
      Table 6-4.
      Start-up Times for the Low Power Crystal Oscillator Clock Selection (Continued)
      Oscillator Source /
      Power Conditions
      Start-up Time from
      Power-down and
      Power-save
      Additional Delay
      from Reset
      (V
      CC = 5.0V)
      CLKSEL
      0SUT1..0
      Table 6-6.
      Internal Calibrated RC Oscillator Operating Modes(1)(3)
      Frequency Range(2) (MHz)
      CKSEL3..0
      7.3 - 8.1
      0010
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