HT66F20 datasheet(246/298 Pages) HOLTEK

246 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

Bit2

RXIF:ReceiveRXRdataregisterstatus

0:RXRdataregisterisempty

1:RXRdataregisterhasavailabledata

TheRXIFflagisthereceivedataregisterstatusflag.Whenthisreadonlyflagis0,

itindicatesthattheRXRreaddataregisterisempty.Whentheflagis1,itindicates

thattheRXRreaddataregistercontainsnewdata.Whenthecontentsoftheshift

registeraretransferredtotheRXRregister,aninterruptisgeneratedifRIE=1inthe

UCR2register.Ifoneormoreerrorsaredetectedinthereceivedword,theappropriate

receive-relatedflagsNF,FERR,and/orPERRaresetwithinthesameclockcycle.The

RXIFflagisclearedwhentheUSRregisterisreadwithRXIFset,followedbyaread

fromtheRXRregister,andiftheRXRregisterhasnodataavailable.

Bit1

TIDLE:Transmissionidle

0:Datatransmissionisinprogress(databeingtransmitted)

1:Nodatatransmissionisinprogress(transmitterisidle)

TheTIDLEflagisknownasthetransmissioncompleteflag.Whenthisreadonlyflag

is0,itindicatesthatatransmissionisinprogress.Thisflagwillbesetto1whenthe

TXIFflagis1andwhenthereisnotransmitdataorbreakcharacterbeingtransmitted.

WhenTIDLEisequalto1,theTXpinbecomesidlewiththepinstateinlogichigh

condition.TheTIDLEflagisclearedbyreadingtheUSRregisterwithTIDLEsetand

thenwritingtotheTXRregister.Theflagisnotgeneratedwhenadatacharacterora

breakisqueuedandreadytobesent.

Bit0

TXIF:TransmitTXRdataregisterstatus

0:characterisnottransferredtothetransmitshiftregister

1:characterhastransferredtothetransmitshiftregister(TXRdataregisterisempty)

TheTXIFflagisthetransmitdataregisteremptyflag.Whenthisreadonlyflagis0,it

indicatesthatthecharacterisnottransferredtothetransmittershiftregister.Whenthe

flagis1,itindicatesthatthetransmittershiftregisterhasreceivedacharacterfromthe

TXRdataregister.TheTXIFflagisclearedbyreadingtheUARTstatusregister(USR)

withTXIFsetandthenwritingtotheTXRdataregister.NotethatwhentheTXENbit

isset,theTXIFflagbitwillalsobesetsincethetransmitdataregisterisnotyetfull.

HT66F20 Datasheet(PDF) 246 Page - Holtek Semiconductor Inc

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