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5.11UniversalAsynchronousReceiver/Transmitter(UART)
5.11.1UARTElectricalData/Timing
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
Thecontains3separateUARTmodules(1withhardwareflowcontrol).Thesemodulesperforms
serial-to-parallelconversionondatareceivedfromaperipheraldeviceormodem,andparallel-to-serial
conversionondatareceivedfromtheCPU.EachUARTalsoincludesaprogrammablebaudrate
generatorcapableofdividingthe24MHzreferenceclockbydivisorsfrom1to65,535toproducea16x
clockdrivingtheinternallogic.TheUARTmodulessupportthefollowingfeatures:
•Frequencypre-scalevaluesfrom1to65,535togenerateappropriatebaudrates
•16-bytestoragespaceforboththetransmitterandreceiverFIFOs
•Uniqueinterrupts,oneforeachUART
•UniqueEDMAevents,bothreceivedandtransmitteddataforeachUART
•1,4,8,or14byteselectablereceiverFIFOtriggerlevelforautoflowcontrolandDMA
•Programmableauto-rtsandauto-ctsforautoflowcontrol(supportedonUART2)
•Programmableserialdataformats
–5,6,7,or8-bitcharacters
–Even,odd,ornoparitybitgenerationanddetection
–1,1.5,or2stopbitgeneration
•Falsestartbitdetection
•Linebreakgenerationanddetection
•Internaldiagnosticcapabilities
–Loopbackcontrolsforcommunicationslinkfaultisolation
–Break,parity,overrun,andframingerrorsimulation
•Modemcontrolfunctions:CTS,RTS(supportedonUART2)
Table5-26.TimingRequirementsforUARTxReceive(seeFigure5-35)
DM355
NO.UNIT
MINMAX
4t
w(URXDB)
Pulseduration,receivedatabit(RXDn)0.99U
(1)
1.05U
(1)
ns
5t
w(URXSB)
Pulseduration,receivestartbit0.99U
(1)
1.05U
(1)
ns
(1)U=UARTbaudtime=1/programmedbaudrate.
Table5-27.SwitchingCharacteristicsOverRecommendedOperatingConditionsforUARTxTransmit
(seeFigure5-35)
DM355
NO.PARAMETERUNIT
MINMAX
UART0/1Maximumprogrammablebaudrate1.5
1f
(baud)
MHz
UART2Maximumprogrammablebaudrate5
2t
w(UTXDB)
Pulseduration,transmitdatabit(TXDn)U-2
(1)
U+2
(1)
ns
3t
w(UTXSB)
Pulseduration,transmitstartbitU-2
(1)
U+2
(1)
ns
(1)U=UARTbaudtime=1/programmedbaudrate.
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