HT45F65 datasheet(90/231 Pages) HOLTEK

90 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

I/O Pin Structures

TheaccompanyingdiagramsillustratetheinternalstructuresofsomegenericI/Opintypes.As

theexactlogicalconstructionoftheI/Opinwilldifferfromthesedrawings,theyaresuppliedasa

guideonlytoassistwiththefunctionalunderstandingoftheI/Opins.Thewiderangeofpin-shared

structuresdoesnotpermitalltypestobeshown.

V DD

Wa ke - up Se le ct

S yst em W ak e- up

Re ad D at a Re gi st er

C ont ro l Bi t

Da ta B us

Wr it e C ont ro l R egi st er

Ch ip R es et

Re ad C on tr ol R egi st er

Wr it e Da ta R egi st er

Da ta B it

I/ O pi n

PA o nl y

We ak

Pu ll- up

Pu ll -H ig h

R egi st er

Se le ct

Generic Input/Output Structure

Programming Considerations

Withintheuserprogram,oneofthefirstthingstoconsiderisportinitialisation.Afterareset,allof

theI/Odataandportcontrolregisterswillbesethigh.ThismeansthatallI/Opinswilldefaultto

aninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhetherpull-high

selectionshavebeenchosen.Iftheportcontrolregisters,PAC~PHC,arethenprogrammedtosetup

somepinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociated

portdataregisters,PA~PH,arefirstprogrammed.Selectingwhichpinsareinputsandwhichare

outputscanbeachievedbyte-widebyloadingthecorrectvaluesintotheappropriateportcontrol

registerorbyprogrammingindividualbitsintheportcontrolregisterusingthe"SET[m].i"and

"CLR[m].i"instructions.Notethatwhenusingthesebitcontrolinstructions,aread-modify-write

operationtakesplace.Themicrocontrollermustfirstreadinthedataontheentireport,modifyitto

therequirednewbitvaluesandthenrewritethisdatabacktotheoutputports.

PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe

SLEEPorIDLEMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahigh

tolowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis

function.

HT45F65 Scheda tecnica(PDF) 90 Page - Holtek Semiconductor Inc

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