HT45F65 datasheet(187/231 Pages) HOLTEK

187 / 231 page

Rev. 1.60

186

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Rev. 1.60

187

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

UART Interface

Thedevicescontainanintegratedfull-duplexasynchronousserialcommunicationsUARTinterface

thatenablescommunicationwithexternaldevicesthatcontainaserialinterface.TheUARTfunction

hasmanyfeaturesandcantransmitandreceivedataseriallybytransferringaframeofdatawith

eightorninedatabitspertransmissionaswellasbeingabletodetecterrorswhenthedatais

overwrittenorincorrectlyframed.TheUARTfunctionpossessesitsowninternalinterruptwhich

canbeusedtoindicatewhenareceptionoccursorwhenatransmissionterminates.

TheintegratedUARTfunctioncontainsthefollowingfeatures:

• Full-duplex,asynchronouscommunication

• 8or9bitscharacterlength

• Even,oddornoparityoptions

• Oneortwostopbits

• Baudrategeneratorwith8-bitprescaler

• Parity,framing,noiseandoverrunerrordetection

• Supportforinterruptonaddressdetect(lastcharacterbit=1)

• Separatelyenabledtransmitterandreceiver

• 2-byteDeepFIFOReceiveDataBuffer

• Transmitandreceiveinterrupts

• Interruptscanbeinitializedbythefollowingconditions:

• TransmitterEmpty

• TransmitterIdle

• ReceiverFull

• ReceiverOverrun

• AddressModeDetect

TX R R egi st er

RX R Re gi st er

MS B

LS B

Tr ans mi tte r S hi ft Re gi st er

TX P in

MS B

LS B

Re ce iv er S hi ft R eg is te r

RX P in

B aud Ra te

G ene ra to r

CL KC LK

Bu ffe r

MC U Da ta B us

UART Data Transfer Scheme

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