HT45F12 datasheet(56/104 Pages) HOLTEK

56 / 104 page

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HT45F12

8-Bit Flash MCU with Op Amps & Comparators

HT45F12

8-Bit Flash MCU with Op Amps & Comparators

Programming Considerations

Withintheuserprogram,oneofthefirstthingstoconsiderisportinitialisation.Afterareset,allof

theI/Odataandportcontrolregisterswillbesethigh.ThismeansthatallI/Opinswilldefaultto

aninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhetherpull-high

selectionshavebeenchosen.Iftheportcontrolregisters,PAC~PCC,arethenprogrammedtosetup

somepinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociated

portdataregisters,PA~PC,arefirstprogrammed.Selectingwhichpinsareinputsandwhichare

outputscanbeachievedbyte-widebyloadingthecorrectvaluesintotheappropriateportcontrol

registerorbyprogrammingindividualbitsintheportcontrolregisterusingthe“SET[m].i”and

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

operationtakesplace.Themicrocontrollermustfirstreadinthedataontheentireport,modifyitto

therequirednewbitvaluesandthenrewritethisdatabacktotheoutputports.

Wr it e to P or t

R ead fr om P or t

S yst em C lo ck

Po rt D at a

Read Modify Write Timing

PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe

SLEEPorIDLEMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahigh

tolowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis

function.Inaddition,thePortBpinsalsoprovideOpenDrainI/Ostructureoptionswhichcanbe

controlledbythespecificregister.

Timer/Event Counter

Theprovisionoftimersformanimportantpartofanymicrocontroller,givingthedesignerameans

ofcarryingouttimerelatedfunctions.Thedevicecontainsasiglecount-uptimerof8-bitcapacity.

Asthetimerhasthreedifferentoperatingmodes,itcanbeconfiguredtooperateasageneraltimer,

anexternaleventcounterorasapulsewidthcapturedevice.Theprovisionofaninternalprescaler

totheclockcircuitryongivingaddedrangetothetimer.

TherearetwotypesofregistersrelatedtotheTimer/EventCounter.Thefirstistheregistersthat

containtheactualvalueoftheTimer/EventCounterandintowhichaninitialvaluecanbepreloaded.

ReadingfromtheseregistersretrievesthecontentsoftheTimer/EventCounter.Thesecondtype

ofassociatedregisteristheTimerControlRegisterwhichdefinesthetimeroptionsanddetermines

howtheTimer/EventCounteristobeused.TheTimer/EventCountercanhaveitsclockconfigured

tocomefromaninternalclocksource.Inaddition,itsclocksourcecanalsobeconfiguredtocome

fromanexternaltimerpin.

TO N

Pr el oad R eg is te r

Ti me r/ Ev ent

Co un te r

Da ta B us

Re l oad

Ov er fl ow

to I nt er ru pt

8- Bi t Ti me r/ Ev en t Co unt er

PF D0

Ti me r/ Ev ent C oun te r

M ode C on tr ol

7- st a ge Pr es ca le r

TP SC 2~ TP SC 0

(1 /1 ~1 /1 28 )

TM 1T M0

f SY S

TM R

Fi lt er

Fi lt er O n/ Of f

Co nf ig ur at io n op ti on

Co m par at or 1

ou tp ut

TM 0 , T M1

8-bit Timer/Event Counter Structure

2. ,

2)# , =J =

Note:TheoutputiscontrolledbyPA5data.

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