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  • 參數(shù)資料
    型號(hào): MC68HC08LT8
    廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
    英文描述: Microcontrollers
    中文描述: 微控制器
    文件頁數(shù): 51/156頁
    文件大小: 1030K
    代理商: MC68HC08LT8
    MC68HC08LT8 Data Sheet, Rev. 1
    Freescale Semiconductor
    51
    Chapter 5
    Oscillator (OSC)
    5.1 Introduction
    The oscillator module provides the reference clocks for the MCU system and bus. Two oscillators are
    running on the device:
    1–16MHz crystal oscillator (OSC) — built-in oscillator that requires an external crystal or
    ceramic-resonator. This oscillator drives the main bus and other MCU subsystems except the LCD
    and PPI modules.
    32.768kHz crystal oscillator (XTAL) — built-in oscillator that requires an external crystal or
    ceramic-resonator. This oscillator drives the LCD and PPI modules.
    5.2 Functional Overview
    The X-tal oscillator circuit is designed for use with an external crystal or ceramic resonator to provide
    accurate clock source.
    In its typical configuration, the X-tal oscillator is connected in a Pierce oscillator configuration, as shown
    in
    Figure 5-1
    . This figure shows only the logical representation of the internal components and may not
    represent actual circuitry. The oscillator configuration uses five components:
    Crystal, X
    1
    & X
    2
    Fixed capacitor, C
    1
    & C
    3
    Tuning capacitor, C
    2
    & C
    4
    (can also be a fixed capacitor)
    Feedback resistor, R
    B
    1
    & R
    B
    2
    Series resistor, R
    S
    (for XTAL1 and XTAL2 only)
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