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參數(shù)資料
| 型號(hào)： | MC912D60CMFU |
| 廠(chǎng)商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁(yè)數(shù)： | 320/439頁(yè) |
| 文件大小： | 2323K |
| 代理商： | MC912D60CMFU |
68HC(9)12D60 — Rev 4.0
Advance Information
MOTOROLA
Appendix: CGM Practical Aspects
387
Advance Information — 68HC(9)12D60
Section 21. Appendix: CGM Practical Aspects
21.1 Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
Practical Aspects For The PLL Usage . . . . . . . . . . . . . . . . . . 390
Printed Circuit Board Guidelines. . . . . . . . . . . . . . . . . . . . . . . 395
21.2 Introduction
This sections provides useful and practical pieces of information
concerning the implementation of the CGM module.
21.3 A Few Hints For The CGM Crystal Oscillator Application
21.3.1 What Loading Capacitors To Choose?
First, from small-signal analysis, it is known that relatively large values
for C1 and C2 have a positive impact on the phase margin. However, the
higher loading they represent decreases the loop gain. Alternatively,
small values for these capacitors will lead to higher open loop gain, but
as the frequency of oscillation approaches the parallel resonance, the
phase margin, and consequently the ability to start-up correctly, will
decrease. From this it is clear that relatively large capacitor values
(>33pF), are reserved for low frequency crystals in the MHz range.
NOTE:
Using the recommended loading capacitor CL value from the crystal
manufacturer is a good starting point. Taking into account unavoidable
strays, this equates to about (CL-2pF).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC912D60CMFU8 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Data |
| MC912D60CMPV8 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Data |
| MC912D60CMPVE | 制造商:Freescale Semiconductor 功能描述:MCU 16BIT HC12 CISC 60KB FLASH 5V 112TQFP - Trays |
| MC912D60CVFU8 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Data |
| MC912D60CVPV | 制造商:Rochester Electronics LLC 功能描述:16 BIT MICROCONTR W/ SGF - Bulk |
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