芯片解密

下面是关于ds87c520芯片的主要性能特征介绍，我们提供给广大客户及其他各类技术工程师参考借鉴。

besidesgreaterspeed,themicrocontrollerincludesasecondfullhardwareserialport,sevenadditionalinterrupts,programmablewatchdogtimer,brownoutmonitor,andpower-failreset.thedevicealsoprovidesdualdatapointers(dptrs)tospeedblockdatamemorymoves.italsocanadjustthespeedofmovxdatamemoryaccessfromtwotoninemachinecyclesforflexibilityinselectingexternalmemoryandperipherals.

theds87c520/ds83c520eprom/romhigh-speedmicrocontrollersarefast81-compatiblemicrocontrollers.theyfeaturearedesignedprocessorcorewithoutwastedclockandmemorycycles.asaresult,thedevicesexecuteevery81instructionbetween5and3timesfasterthantheoriginalforthesamecrystalspeed.typicalapplicationswillseeaspeedimprovementof5timesusingthesamecodeandthesamecrystal.theds87c520/ds83c520offeramaximumcrystalspeedof33mhz,resultinginapparentexecutionspeedsof85mhz(approximately5x).

anewpowermanagementmode(pmm)isusefulforportableapplications.thisfeatureallowssoftwaretoselectalowerspeedclockasthemaintimebase.whilenormaloperationhasamachinecyclerateof4clockspercycle,thepmmrunstheprocessorat64or14clockspercycle.forexample,at12mhz,standardoperationhasamachinecyclerateof3mhz.inpowermanagementmode,softwarecanselecteither185khzor17khzmachinecyclerate.thereisacorrespondingreductioninpowerconsumptionwhentheprocessorrunsslower.

theds83c520isafactorymaskromversionoftheds87c520designedforhigh-volume,costsensitiveapplications.itisidenticalinallrespectstotheds87c520,exceptthatthe16kbofepromisreplacedbyauser-suppliedapplicationprogram.allreferencestofeaturesoftheds87c520willapplytotheds83c520,withtheexceptionofeprom-specificfeatureswherenoted.pleasecontactyourlocaldallassemiconductorsalesrepresentativefororderinginformation.

80c52compatible

81pin-andinstruction-setcompatible

four8-biti/oports

256bytesscratchpadram

largeon-chipmemory

16kbprogrammemory

1kbextraon-chipsramformovx

romsizefeature

selectsinternalromsizefrom0to16kb

allowsaccesstoentireexternalmemorymap

dynamicallyadjustablebysoftware

usefulasbootblockforexternalflash

high-speedarchitecture

4clocks/machinecycle(81=1

runsdcto33mhzclockrates

single-cycleinstructionin121ns

dualdatapointer

optionalvariablelengthmovxtoaccess

fast/slowram/peripherals

powermanagementmode

programmableclocksourcetosavepower

cpurunsfrom(crystal/6or(crystal/1

providesautomatichardwareandsoftwareexit

emireductionmodedisablesale

twofull-duplexhardwareserialports

highintegrationcontrollerincludes:

power-failreset

early-warningpower-failinterrupt

programmablewatchdogtimer

13interruptsourceswithsixexternal

availablein40-pinpdip,44-pinplcc,44-pintqfp,and40-pinwindowedcerdip

factorymaskds83c520oreprom(otp)ds87c520

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