 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT66F20 Datasheet(PDF) 245 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT66F20 Datasheet(HTML) 245 Page - Holtek Semiconductor Inc |
|
|
245 / 298 page  Rev. 1.90 �44 �e���a�� 18� �01� Rev. 1.90 �45 �e���a�� 18� �01� 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 USR Register TheUSRregisteristhestatusregisterfortheUART,whichcanbereadbytheapplicationprogram todeterminethepresentstatusoftheUART.AllflagswithintheUSRregisterarereadonly.Further explanationoneachoftheflagsisgivenbelow: Bit 7 6 5 4 3 2 1 0 Name PERR N� �ERR OERR RIDLE RXI� TIDLE TXI� R/W R R R R R R R R POR 0 0 0 0 1 0 1 1 Bit7 PERR:Parityerrorflag 0:Noparityerrorisdetected 1:Parityerrorisdetected ThePERRflagistheparityerrorflag.Whenthisreadonlyflagis0,itindicatesa parityerrorhasnotbeendetected.Whentheflagis1,itindicatesthattheparityofthe receivedwordisincorrect.ThiserrorflagisapplicableonlyifParitymode(oddor even)isselected.Theflagcanalsobeclearedbyasoftwaresequencewhichinvolves areadtothestatusregisterUSRfollowedbyanaccesstotheRXRdataregister. Bit6 NF:Noiseflag 0:Nonoiseisdetected 1:Noiseisdetected TheNRflagisthenoiseflag.Whenthisreadonlyflagis0,itindicatesnonoise condition.Whentheflagis1,itindicatesthattheUARThasdetectednoiseonthe receiverinput.TheNFflagissetduringthesamecycleastheRXIFflagbutwillnot besetinthecaseofasoverrun.TheNFflagcanbeclearedbyasoftwaresequence whichwillinvolveareadtothestatusregisterUSRfollowedbyanaccesstotheRXR dataregister. Bit5 FERR:Framingerrorflag 0:Noframingerrorisdetected 1:Framingerrorisdetected TheFERRflagistheframingerrorflag.Whenthisreadonlyflagis"0",itindicates thatthereisnoframingerror.Whentheflagis"1",itindicatesthataframingerror hasbeendetectedforthecurrentcharacter.Theflagcanalsobeclearedbyasoftware sequencewhichwillinvolveareadtothestatusregisterUSRfollowedbyanaccessto theRXRdataregister. Bit4 OERR:Overrunerrorflag 0:Nooverrunerrorisdetected 1:Overrunerrorisdetected TheOERRflagistheoverrunerrorflagwhichindicateswhenthereceiverbufferhas overflowed.Whenthisreadonlyflagis0,itindicatesthatthereisnooverrunerror. Whentheflagis1,itindicatesthatanoverrunerroroccurswhichwillinhibitfurther transferstotheRXRreceivedataregister.Theflagisclearedbyasoftwaresequence, whichisareadtothestatusregisterUSRfollowedbyanaccesstotheRXRdata register. Bit3 RIDLE:Receiverstatus 0:Datareceptionisinprogress(databeingreceived) 1:Nodatareceptionisinprogress(receiverisidle) TheRIDLEflagisthereceiverstatusflag.Whenthisreadonlyflagis0,itindicates thatthereceiverisbetweentheinitialdetectionofthestartbitandthecompletion ofthestopbit.Whentheflagis1,itindicatesthatthereceiverisidle.Betweenthe completionofthestopbitandthedetectionofthenextstartbit,theRIDLEbitis1 indicatingthattheUARTreceiverisidleandtheRXpinstaysinlogichighcondition. |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
