參數(shù)資料
型號(hào)： TS68332MR16
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： High performance 32-bit integrated microcontroller
中文描述： 32-BIT, 16.78 MHz, MICROCONTROLLER, CPGA132
封裝： CERAMIC, PGA-132
文件頁(yè)數(shù)： 40/56頁(yè)
文件大?。?/td> 1510K
代理商： TS68332MR16
40
TS68332
2118A–HIREL–03/02
Figure22.
ClockSubmoduleBlockDiagram
Note:
Mustbelowleakagecapacitor.
ClockSynthesizer
Theclocksynthesizer(Figure22)canoperatefromanon-chipphaselockedloop(PLL)
usinganexternalcrystalconnectedbetweentheEXTALandXTALpinsasareference
frequencysource.A32.768kHzwatchcrystalprovidesaninexpensivereference,but
thereferencecrystalfrequencycanbeanyfrequencyfrom25-50kHz.Outsidethe25-
50kHzrange,anexternaloscillatorcanbeusedwiththeon-chipsynthesizerandVCO,
orthefrequencycanbedrivendirectlyintotheEXTALpin(theXTALpinshouldbeleft
floatingforthiscase).
Thesystemclockfrequencyisprogrammablefrom131kHztothemaximumclockfre-
quencywitharesolutionof131kHz.Aseparatepowerpin(V
DDSYN
)isusedtoallowthe
clockcircuitstorunwiththerestoftheMCUpowereddownandtoprovideincreased
noiseimmunityfortheclockcircuits.Ifforsomereasontheexternalsignalisremoved
fromthedevicethentheclocksynthesizerwillgenerateitsowninternalclocksignalto
allowthedevicetoentersomekindoferrorrecoveryroutine.ThisisknownasLIMP
mode.Theclockfrequencygeneratedwillnothaveanassociatedtimingspecbut
shouldbearound9MHz.
Chip-selectSubmodule
Typicalmicrocomputersystemsrequireexternalhardwaretoprovideselectsignalsto
externalperipherals.ThisMCUintegratesthesefunctionson-chipinordertoprovidethe
cost,speed,andreliabilitybenefitsofahigherlevelofintegration.Thechip-selectsig-
nalscanalsobeprogrammedasoutputenable,readorwritestrobe,orIACKsignals.
Sinceinitializationsoftwarewouldprobablyresideinaperipheralmemorydevicecon-
trolledbythechip-selectcircuits,aCSBOOTregisterprovidesdefaultresetvaluesto
supportbootstrapoperation.
Thechip-selectsubmodulesupportsthefollowingprogrammablefeatures:
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