HT82B42R datasheet(25/86 Pages) HOLTEK

25 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

Input/Output Ports

HoltekmicrocontrollersofferconsiderableflexibilityontheirI/Oports.Withtheinputoroutput

designationofeverypinfullyunderuserprogramcontrol,pull-highoptionsforallportsand

wake-upoptionsoncertainpins,theuserisprovidedwithanI/Ostructuretomeettheneedsofa

widerangeofapplicationpossibilities.

Dependinguponwhichpackageischosen,themicrocontrollerprovidesupto15bidirectional

input/outputlineslabeledwithportnamesPA,PBandPE.

TheseI/OportsaremappedtotheDataMemorywithaddressesasshownintheSpecialPurpose

DataMemorytable.Forinputoperation,theseportsarenon-latching,whichmeanstheinputsmust

bereadyattheT2risingedgeofinstruction"MOVA,[m]",wheremdenotestheportaddress.For

outputoperation,allthedataislatchedandremainsunchangeduntiltheoutputlatchisrewritten.

Pull-high Resistors

Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiring

theuseofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,I/Opins,when

configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.The

pull-highresistorsareselectableviaconfigurationoptionsandareimplementedusingweakPMOS

transistors.ApinornibbleoptionontheI/Oportscanbeselectedtoselectpull-highResistors.

NotethatthePE2ispinsharedwithresetpin,theI/OstructureisNMOSopendrain,andthereisno

pull-highresistorforthispin.

Port A CMOS/NMOS/PMOS Structure

ThepinsonPortAcanbesetupviaconfigurationoptiontobeeitherCMOS,NMOSorPMOS

types.

Port A VDD/V33O Option Structure

ThepowersupplyforthePortApinscanbesetupviaconfigurationoptiontobeeitherVDDor

V33O.

Port Pin Wake-up

IftheHALTinstructionisexecuted,thedevicewillenterthePowerDownMode,wherethesystem

clockwillstopresultinginpowerbeingconserved,afeaturethatisimportantforbatteryandother

low-powerapplications.Variousmethodsexisttowake-upthemicrocontroller,oneofwhichisto

changethelogicconditionononeoftheportpinsfromhightolow.AfteraHALTinstructionforces

themicrocontrollerintoenteringthePowerDownMode,theprocessorwillremaininalow-power

stateuntilthelogicconditionoftheselectedwake-uppinontheportpinchangesfromhightolow.

Thisfunctionisespeciallysuitableforapplicationsthatcanbewokenupviaexternalswitches.Each

pinonPA,PBandPEhasthecapabilitytowake-upthedeviceonanexternalfallingedge.Note

thatsomepinscanonlybesetupnibblewidewhereasothercanbebitselectedtohaveawake-up

function.

HT82B42R Datasheet(PDF) 25 Page - Holtek Semiconductor Inc

HT82B42R Datasheet(HTML) 25 Page - Holtek Semiconductor Inc

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