HT67F488 datasheet(112/171 Pages) HOLTEK

112 / 171 page

Rev. 1.60

11�

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

UART Interface

Eachdevicecontainsanintegratedfull-duplexasynchronousserialcommunicationsUARTinterface

thatenablescommunicationwithexternaldevicesthatcontainaserialinterface.TheUARTfunction

hasmanyfeaturesandcantransmitandreceivedataseriallybytransferringaframeofdatawith

eightorninedatabitspertransmissionaswellasbeingabletodetecterrorswhenthedatais

overwrittenorincorrectlyframed.TheUARTfunctionpossessesitsowninternalinterruptwhich

canbeusedtoindicatewhenareceptionoccursorwhenatransmissionterminates.

TheintegratedUARTfunctioncontainsthefollowingfeatures:

• Full-duplex,UniversalAsynchronousReceiverandTransmitter(UART)communication

• 8or9bitscharacterlength

• Even,oddornoparityoptions

• Oneortwostopbits

• Baudrategeneratorwith8-bitprescaler

• Parity,framing,noiseandoverrunerrordetection

• Supportforinterruptonaddressdetect(lastcharacterbit=1)

• Transmitterandreceiverenabledindependently

• 2-byteDeepFIFOReceiveDataBuffer

• TransmitandReceiveMultipleInterruptGenerationSources:

♦

TransmitterEmpty

♦

TransmitterIdle

♦

ReceiverFull

♦

ReceiverOverrun

♦

AddressModeDetect

♦

RXpinwake-upinterrupt

TX R Re gi st er

RX R Re gi st er

MS B

LS B

Tr an sm i tte r S hi ft Re gi st er

TX P in

MS B

LS B

Re ce iv er Sh i ft R eg is te r

RX P in

Ba ud R at e

Ge ner at or

CL KC LK

Bu ff er

MC U Da ta B us

UART Data Transfer Scheme

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