HT45F5Q datasheet(56/114 Pages) HOLTEK

56 / 114 page

Rev. 1.10

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HT45F5Q

Charger Flash MCU

HT45F5Q

Charger Flash MCU

V DD

Re ad D at a R egi st er

Co nt 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 eg is te r

Da ta B it

A/ D I npu t P or t

S AC S3 ~S AC S0

To A /D C onv er te r

We ak

Pu ll -u p

An al og

In put

Se le ct or

Pu ll- Hi gh

Re gi st er

Se le ct

A/D Input/Output Structure

Programming Considerations

Withintheuserprogram,oneofthefirstthingstoconsiderisportinitialisation.Afterareset,all

oftheI/Odataandportcontrolregisterswillbesethigh.ThismeansthatallI/Opinswilldefault

toaninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhetherpull-

highselectionshavebeenchosen.Iftheportcontrolregistersarethenprogrammedtosetupsome

pinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociatedport

dataregistersarefirstprogrammed.Selectingwhichpinsareinputsandwhichareoutputscanbe

achievedbyte-widebyloadingthecorrectvaluesintotheappropriateportcontrolregisterorby

programmingindividualbitsintheportcontrolregisterusingthe“SET[m].i”and“CLR[m].i”

instructions.Notethatwhenusingthesebitcontrolinstructions,aread-modify-writeoperationtakes

place.Themicrocontrollermustfirstreadinthedataontheentireport,modifyittotherequirednew

bitvaluesandthenrewritethisdatabacktotheoutputports.

PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe

SLEEPorIDLEMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahigh

tolowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis

function.

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