HT45F56 datasheet(56/90 Pages) HOLTEK

56 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Compact Type TM Operation Modes

TheCompactTypeTMcanoperateinoneofthreeoperatingmodes,CompareMatchOutputMode,

PWMModeorTimer/CounterMode.TheoperatingmodeisselectedusingtheCTM1andCTM0

bitsintheCTMC1register.

Compare Match Output Mode

Toselectthismode,bitsCTM1andCTM0intheCTMC1register,shouldbesetto“00”

respectively.Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythree

methods.Theseareacounteroverflow,acomparematchfromComparatorAandacomparematch

fromComparatorP.WhentheCTCCLRbitislow,therearetwowaysinwhichthecountercanbe

cleared.OneiswhenacomparematchoccursfromComparatorP,theotheriswhentheCCRPbits

areallzerowhichallowsthecountertooverflow.HerebothCTMAFandCTMPFinterruptrequest

flagsfortheComparatorAandComparatorPrespectively,willbothbegenerated.

IftheCTCCLRbitintheCTMC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheCTMAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

CTCCLRishighnoCTMPFinterruptrequestflagwillbegenerated.IftheCCRAbitsareallzero,

thecounterwilloverflowwhenitsreachesitsmaximum10-bit,3FFHex,value,howeverherethe

CTMAFinterruptrequestflagwillnotbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theCTMoutputpinwillchange

state.TheCTMoutputpinconditionhoweveronlychangesstatewhenaCTMAFinterruptrequest

flagisgeneratedafteracomparematchoccursfromComparatorA.TheCTMPFinterruptrequest

flag,generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheCTM

outputpin.ThewayinwhichtheCTMoutputpinchangesstatearedeterminedbytheconditionof

theCTIO1andCTIO0bitsintheCTMC1register.TheCTMoutputpincanbeselectedusingthe

CTIO1andCTIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacompare

matchoccursfromComparatorA.TheinitialconditionoftheCTMoutputpin,whichissetupafter

theCTONbitchangesfromlowtohigh,issetupusingtheCTOCbit.NotethatiftheCTIO1and

CTIO0bitsarezerothennopinchangewilltakeplace.

HT45F56 Datasheet(PDF) 56 Page - Holtek Semiconductor Inc