參數(shù)資料
型號(hào)： TS68332DESC01ZC
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)： 37/56頁(yè)
文件大?。?/td> 1510K
代理商： TS68332DESC01ZC
37
TS68332
2118A–HIREL–03/02
BusArbitration
ThebusdesignoftheMCUprovidesforasinglebusmasteratanyonetime:eitherthe
MCUoranexternaldevice.Oneormoreoftheexternaldevicesonthebuscanhave
thecapabilityofbecomingbusmaster.Busarbitrationistheprotocolbywhichanexter-
naldevicebecomesbusmaster;thebuscontrollerintheMCUmanagesthebus
arbitrationsignalssothattheMCUhasthelowestpriority.Externaldevicesthatneedto
obtainthebusmustassertthebusarbitrationsignalsinacertainsequence.Systems
thatincludeseveraldevicesthatcanbecomebusmasterrequireexternalcircuitryto
assignprioritiestothedevices,sothatwhentwoormoreexternaldevicesattemptto
becomebusmasteratthesametime,theonehavingthehighestprioritybecomesthe
busmasterfirst.TheprotocolisexplainedfullyintheSIMmanual,howeverhereisthe
basicsequenceofevents:
Anexternaldeviceassertsthebusrequestsignal(BR),
TheMCUassertsthebusgrantsignaltoindicatethatthebusisavailable(BG),
Theexternaldeviceassertsthebusgrantacknowledgesignal(BGACK)toindicate
thatithasassumedbusmastership.
Busarbitrationrequestsarerecognizedduringnormalprocessing,HALTassertion,
whentheCPUhashaltedduetoadoublebusfault.
ResetOperation
TheMCUhasresetcontrollogictodeterminethecauseofresetandsynchronizeitif
necessary.IfanexternaldevicedrivestheRESETpinlow,theresetcontrollogicholds
RESETassertedinternallyuntiltheexternalRESETisreleased.Whentheresetcontrol
logicdetectsthattheexternalRESETisnolongerbeingdriven,itdrivesRESETlowfor
anadditional512cyclestoguaranteethislengthofresettotheentiresystem.IfRESET
isassertedfromanyothersource,theresetcontrollogicassertsRESETforaminimum
of512cyclesanduntilthesourceofresetisnegated.Figure20isatimingdiagramof
thepower-upresetoperation,showingtherelationshipbetweenRESET,V
DD
,andbus
signals.Duringtheresetperiod,theentirebus(exceptfornon-tri-statablesignals,which
aredriventotheirinactivestatethree-states.OnceRESETnegates,allcontrolsignals
aredriventotheirinactivestate,thedatabusisinreadmode,andtheaddressbusis
driven.Afterthis,thefirstbuscycleforRESETexceptionprocessingbegins.
RESETshouldbeassertedforatleast590clockperiodstoensurethattheMCUresets.
ResettingtheMCUcausesanybuscycleinprogresstoterminateasifDSACKxor
BERRhasbeenasserted.Inaddition,theMCUinitializesregistersappropriatelyfora
resetexception.
ForfurtherinformationrefertotheSystemIntegrationModuleManual.
相關(guān)PDF資料
PDF描述
TS68332DESC02XA High performance 32-bit integrated microcontroller
TS68332DESC02ZC High performance 32-bit integrated microcontroller
TS68332MA16 High performance 32-bit integrated microcontroller
TS68332MA20 High performance 32-bit integrated microcontroller
TS68332MR16 High performance 32-bit integrated microcontroller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS68332DESC02XA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High performance 32-bit integrated microcontroller
TS68332DESC02ZC 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High performance 32-bit integrated microcontroller
TS68332MA16 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High performance 32-bit integrated microcontroller
TS68332MA20 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High performance 32-bit integrated microcontroller
TS68332MA20A 制造商:e2v technologies 功能描述:TS68332MA20A - Trays
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