HT66F4530 datasheet(162/224 Pages) HOLTEK

162 / 224 page

Rev. 1.00

1��

De�e��e� �1� �01�

Rev. 1.00

1�3

De�e��e� �1� �01�

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

Managing Receiver Errors

SeveraltypesofreceptionerrorscanoccurwithintheUARTmodule,thefollowingsectiondescribes

thevarioustypesandhowtheyaremanagedbytheUART.

Overrun Error – OERR

TheTXR_RXRregisteriscomposedofatwobytedeepFIFOdatabuffer,wheretwobytescanbe

heldintheFIFOregister,whileathirdbytecancontinuetobereceived.Beforethisthirdbytehas

beenentirelyshiftedin,thedatashouldbereadfromtheTXR_RXRregister.Ifthisisnotdone,the

overrunerrorflagOERRwillbeconsequentlyindicated.

Intheeventofanoverrunerroroccurring,thefollowingwillhappen:

• TheOERRflagintheUSRregisterwillbeset.

• TheTXR_RXRcontentswillnotbelost.

• Theshiftregisterwillbeoverwritten.

• AninterruptwillbegeneratediftheRIEbitisset.

TheOERRflagcanbeclearedbyanaccesstotheUSRregisterfollowedbyareadtotheTXR_

RXRregister.

Noise Error – NF

Over-samplingisusedfordatarecoverytoidentifyvalidincomingdataandnoise.Ifnoiseis

detectedwithinaframethefollowingwilloccur:

• Thereadonlynoiseflag,NF,intheUSRregisterwillbesetontherisingedgeoftheRXIFbit.

• DatawillbetransferredfromtheShiftregistertotheTXR_RXRregister.

• Nointerruptwillbegenerated.HoweverthisbitrisesatthesametimeastheRXIFbitwhich

itselfgeneratesaninterrupt.

NotethattheNFflagisresetbyaUSRregisterreadoperationfollowedbyaTXR_RXRregister

readoperation.

Framing Error – FERR

Thereadonlyframingerrorflag,FERR,intheUSRregister,issetifazeroisdetectedinsteadof

stopbits.Iftwostopbitsareselected,bothstopbitsmustbehigh;otherwisetheFERRflagwill

beset.TheFERRflagandthereceiveddatawillberecordedintheUSRandTXR_RXRregisters

respectively,andtheflagisclearedinanyreset.

Parity Error – PERR

Thereadonlyparityerrorflag,PERR,intheUSRregister,issetiftheparityofthereceivedwordis

incorrect.Thiserrorflagisonlyapplicableiftheparityisenabled,PREN=1,andiftheparitytype,

oddorevenisselected.ThereadonlyPERRflagandthereceiveddatawillberecordedintheUSR

andTXR_RXRregistersrespectively.Itisclearedonanyreset,itshouldbenotedthattheflags,

FERRandPERR,intheUSRregistershouldfirstbereadbytheapplicationprogrambeforereading

thedataword.

HT66F4530 Datasheet(PDF) 162 Page - Holtek Semiconductor Inc

HT66F4530 Datasheet(HTML) 162 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL