HT68F003 datasheet(56/119 Pages) HOLTEK

56 / 119 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

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.Iftheportcontrolregisteristhenprogrammedtosetupsomepins

asoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociatedportdata

registerisfirstprogrammed.Selectingwhichpinsareinputsandwhichareoutputscanbeachieved

byte-widebyloadingthecorrectvaluesintotheappropriateportcontrolregisterorbyprogramming

individualbitsintheportcontrolregisterusingthe"SET[m].i"and"CLR[m].i"instructions.

Notethatwhenusingthesebitcontrolinstructions,aread-modify-writeoperationtakesplace.The

microcontrollermustfirstreadinthedataontheentireport,modifyittotherequirednewbitvalues

andthenrewritethisdatabacktotheoutputports.

PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe

SLEEPorIDLEMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahigh

tolowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis

function.

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