HT67F488 datasheet(59/171 Pages) HOLTEK

59 / 171 page

Rev. 1.60

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Pull-high Resistors

Manyproductapplicationsrequirepull-highresistorsfortheirswitchinputsusuallyrequiringthe

useofanexternalresistor.Toeliminatetheneedfortheseexternalresistors,allI/Opins,when

configuredasaninputhavethecapabilityofbeingconnectedtoaninternalpull-highresistor.These

pull-highresistorsareselectedusingregistersPAPU~PFPU,andareimplementedusingweak

PMOStransistors.

Port A Wake-up

TheHALTinstructionforcesthemicrocontrollerintotheSLEEPorIDLEModewhichpreserves

power,afeaturethatisimportantforbatteryandotherlow-powerapplications.Variousmethods

existtowake-upthemicrocontroller,oneofwhichistochangethelogicconditionononeofthePort

Apinsfromhightolow.Thisfunctionisespeciallysuitableforapplicationsthatcanbewokenup

viaexternalswitches.EachpinonPortAcanbeselectedindividuallytohavethiswake-upfeature

usingthePAWUregister.

PAWU Register

Bit

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PAWU7

PAWU6

PAWU5

PAWU4

PAWU3

PAWU�

PAWU1

PAWU0

R/W

POR

Bit7~0

PAWU7~PAWU0:PortAbit7~bit0Wake-upControl

0:Disable

1:Enable

I/O Port Control Registers

EachI/OporthasitsowncontrolregisterknownasPAC~PFC,tocontroltheinput/output

configuration.Withthiscontrolregister,eachCMOSoutputorinputcanbereconfigured

dynamicallyundersoftwarecontrol.EachpinoftheI/Oportsisdirectlymappedtoabitinits

associatedportcontrolregister.FortheI/Opintofunctionasaninput,thecorrespondingbitofthe

controlregistermustbewrittenasa“1”.Thiswillthenallowthelogicstateoftheinputpintobe

directlyreadbyinstructions.Whenthecorrespondingbitofthecontrolregisteriswrittenasa“0”,

theI/OpinwillbesetupasaCMOSoutput.Ifthepiniscurrentlysetupasanoutput,instructions

canstillbeusedtoreadtheoutputregister.However,itshouldbenotedthattheprogramwillinfact

onlyreadthestatusoftheoutputdatalatchandnottheactuallogicstatusoftheoutputpin.

Pin-shared Functions

Theflexibilityofthemicrocontrollerrangeisgreatlyenhancedbytheuseofpinsthathavemore

thanonefunction.Limitednumbersofpinscanforceseriousdesignconstraintsondesignersbutby

supplyingpinswithmulti-functions,manyofthesedifficultiescanbeovercome.Forthesepins,the

chosenfunctionofthemulti-functionI/Opinsisselectedbyaseriesofregistersviatheapplication

programcontrol.

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