HT45F75 datasheet(70/190 Pages) HOLTEK

70 / 190 page

Rev. 1.10

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Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Bit3~2

PCPS3~PCPS2:PC7~PC4sourcecurrentselection

00:Sourcecurrent=Level0(min.)

01:Sourcecurrent=Level1

10:Sourcecurrent=Level2

11:Sourcecurrent=Level3(max.)

Bit1~0

PCPS1~PCPS0:PC3~PC0sourcecurrentselection

00:Sourcecurrent=Level0(min.)

01:Sourcecurrent=Level1

10:Sourcecurrent=Level2

11:Sourcecurrent=Level3(max.)

I/O Pin Structures

TheaccompanyingdiagramsillustratetheinternalstructuresofsomegenericI/Opintypes.As

theexactlogicalconstructionoftheI/Opinwilldifferfromthesedrawings,theyaresuppliedasa

guideonlytoassistwiththefunctionalunderstandingoftheI/Opins.Thewiderangeofpin-shared

structuresdoesnotpermitalltypestobeshown.

V DD

Wa ke -u p Se le ct

S yst em W ak e- up

R ead Da ta R egi st er

Co nt ro l Bi t

Da ta B us

Wr it e C ont ro l Re gi st er

Ch ip R es et

Re ad C on tr ol R eg is te r

Wr it e Da ta R egi st er

Da ta B it

I/O p in

PA o nl y

We ak

Pu ll- up

Pu ll -H ig h

Re gi 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~PDC,arethenprogrammedtosetup

somepinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociated

portdataregisters,PA~PD,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.

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