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MC9S12XDP512CAL 数据手册 - Freescale（飞思卡尔）
制造商:
Freescale（飞思卡尔）
分类:
微控制器
封装:
LQFP-112
描述:
16位微控制器 - MCU 9S12XDP512 TSMC3 GENERAL
Pictures:
3D模型
符号图
焊盘图
引脚图
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页面导航:
引脚图在P49P50P51P694P746P808P809P810P811P812P813P814Hot
典型应用电路图在P98P1268
原理图在P34P35P36P81P120P125P126P160P161P185P310P351
封装尺寸在P1288P1289P1290P1291
型号编码规则在P1306
封装信息在P1243
功能描述在P98P122P152P180P202P350P380P409P421P456P493P528
技术参数、封装参数在P1239
电气规格在P122P799P1237P1238P1239P1240P1241P1242P1243P1244P1245P1246
型号编号列表在P1306
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MC9S12XDP512CAL数据手册
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若手册格式错乱，请下载阅览PDF原文件
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor 119
Chapter 3
Pierce Oscillator (S12XOSCLCPV1)
3.1 Introduction
The Pierce oscillator (XOSC) module provides a robust, low-noise and low-power clock source. The
module will be operated from the V
DDPLL
supply rail (2.5 V nominal) and require the minimum number
of external components. It is designed for optimal start-up margin with typical crystal oscillators.
3.1.1 Features
The XOSC will contain circuitry to dynamically control current gain in the output amplitude. This ensures
a signal with low harmonic distortion, low power and good noise immunity.
• High noise immunity due to input hysteresis
• Low RF emissions with peak-to-peak swing limited dynamically
• Transconductance (gm) sized for optimum start-up margin for typical oscillators
• Dynamic gain control eliminates the need for external current limiting resistor
• Integrated resistor eliminates the need for external bias resistor
• Low power consumption:
— Operates from 2.5 V (nominal) supply
— Amplitude control limits power
• Clock monitor
3.1.2 Modes of Operation
Two modes of operation exist:
1. Loop controlled Pierce oscillator
2. External square wave mode featuring also full swing Pierce without internal feedback resistor
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