基于AVR及无线收发模块地脉搏监测系统翻译原文].doc

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1、桂林电子科技大学毕业设计（论文）专用纸第27页共26页PrefaceDuringtheearlyyearsofmicroprocessors,therewerefewengineerswitheducationandexperienceintheapplicationsofmicroprocessortechnology.Nowthatmicroprocessorsandmicrocontrollershavebecomepervasiveinsomanydevices,theabilityto

2、usethemhasbecomealmostarequirementformanytechnicalpeople.Todaythemicroprocessorandthemicrocontrollerhavebecometwoofthemostpowerfultoolsavailabletothescientistandengineer.Microcontrollershavebeenembeddedinsomanyproductsthatitiseasytooverlookthefacttha

3、ttheygreatlyoutnumberpersonalcomputers.MillionsofPCsareshippedeachyear,butbillionsofmicrocontrollersshipannually.Whileagreatdealofattentionisgiventopersonalcomputers,thevastmajorityofnewdesignsareforembeddedapplications.ForeveryPCdesigner,therearetho

4、usandsofdesignersusingmicrocontrollersinembeddedapplications.Thenumberofembeddeddesignsisgrowingquickly.Thepurposeofthisbookistogivethereaderthebasicdesignandanalysisskillstodesignreliablemicrocontrollerormicroprocessorbasedsystems.Theemphasisinthisb

5、ookisonthepracticalaspectsofinterfacingtheprocessortomemoryandI/Odevices,andthebasicsofinterfacingsuchadevicetotheoutsideworld.Amajorgoalofthisbookistoshowhowtomakedevicesthatareinherentlyreliablebydesign.Whilealotofattentionhasbeengivento“qualityimp

6、rove-ment,”themajorityoftheemphasishasbeenplacedontheprocessesthatoccurafterthedesignofaproductiscomplete.Designdeficienciesareasig-nificantproblem,andcanbeexceedinglydifficulttoidentifyinthefield.Thesetypesofqualityproblemscanbeaddressedinthedesignp

7、hasewithrelativelylittleeffort,andwithfarlessexpensethanwillbeincurredlaterintheprocess.Unfortunately,therearemanyhardwaredesignersandorganiza-tionsthat,forvariousreasons,donotunderstandthesignificanceandex-penseofanunreliabledesign.Thedesignmethodol

8、ogypresentedinthistextisintendedtoaddressthisproblem.Learningtodesignanddevelopamicrocontrollersystemwithoutanypracticalhands-onexperienceisabitliketryingtolearntorideabikefromreadingbook.Thus,anothergoalistoprovideapracticalexampleofacompleteworking