參數(shù)資料
型號: MC68HC08LT8CFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù): 104/156頁
文件大小: 1107K
代理商: MC68HC08LT8CFGE
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, X1 & X2
Fixed capacitor, C1 & C3
Tuning capacitor, C2 & C4 (can also be a fixed capacitor)
Feedback resistor, R
B
1 & RB2
Series resistor, R
S (for XTAL1 and XTAL2 only)
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