HT45F56 datasheet(51/90 Pages) HOLTEK

51 / 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 Timer Module – CTM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdevicesistheabilitytocontrol

andmeasuretime.ToimplementtimerelatedfunctionsthedeviceincludesoneTimerModule,

generallyabbreviatedtothenameTM.ThisTMisthesimplesttypeoftheTMswhichcontainsa

multi-purposetimingunit.AlthoughthesimplestformoftheTMtypes,theCompactTMtypestill

containsthreeoperatingmodes,whichareCompareMatchOutput,Timer/EventCounterandPWM

Outputmodes.TheCompactTMcanalsobecontrolledwithanexternalinputpinandcandriveone

externaloutputpin.

ThekeytounderstandinghowtheTMoperatesistoseeitintermsofafreerunningcount-up

counterwhosevalueisthencomparedwiththevalueofpre-programmedinternalcomparators.

Whenthefreerunningcount-upcounterhasthesamevalueasthepre-programmedcomparator,

knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe

counterandperhapsalsochangetheconditionoftheTMoutputpin.TheCTMhastwointerrupts,

oneforeachoftheinternalcomparatorAorcomparatorP,whichgenerateaTMinterruptwhen

acomparematchconditionoccurs.WhenaTMinterruptisgenerated,itcanbeusedtoclearthe

counterandalsotochangethestateoftheTMoutputpin.

TheinternalTMcounterisdrivenbyauserselectableclocksource,whichcanbeaninternal

clockoranexternalpin.Theselectionoftherequiredclocksourceisimplementedusingthe

CTCK2~CTCK0bitsintheCTMcontrolregisters.Theclocksourcecanbearatioofthesystem

clock,fSYS,ortheinternalhighclock,fH,thefSUBclocksourceortheexternalCTCKpin.TheCTCK

pinclocksourceisusedtoallowanexternalsignaltodrivetheTMasanexternalclocksourcefor

eventcounting.

TheTMoutputpincanbeselectedusingthecorrespondingpin-sharedfunctionselectionbits

describedinthePin-sharedFunctionsection.WhentheTMisintheCompareMatchOutputMode,

thesepinscanbecontrolledbytheTMtoswitchtoahighorlowlevelortotogglewhenacompare

matchsituationoccurs.TheexternalCTPoutputpinisalsothepinwheretheTMgeneratesthe

PWMoutputwaveform.AstheTMoutputpinsarepin-sharedwithotherfunctions,theTMoutput

functionmustfirstbesetupusingrelevantpin-sharedfunctionselectionregister.

CTM Core

CTM Input Pin

CTM Output Pin

10-bit CTM

CTCK

CTP

fSYS

fSYS/4

fH/64

fH/16

fSUB

CTCK

000

001

010

011

100

101

110

111

CTCK2~CTCK0

10-bit Count-up Counter

3-bit Comparator P

CCRP

b7~b9

b0~b9

10-bit Comparator A

CTON

CTPAU

Comparator A Match

Comparator P Match

Counter Clear 0

Output

Control

Polarity

Control

CTP

CTOC

CTM1, CTM0

CTIO1, CTIO0

CTMAF Interrupt

CTMPF Interrupt

CTPOL

Pin-shared

control bit

CCRA

CTCCLR

fSUB

Compact Type TM Block Diagram

HT45F56 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc

HT45F56 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90

Datasheet Download

Link URL