HT45F39 datasheet(71/102 Pages) HOLTEK

71 / 102 page

Rev. 1.10

July 01, 2016

Rev. 1.10

July 01, 2016

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

HT45F39/HT45F391

Ultrasonic Distance Measurement 8-bit Flash MCU

TheSAVPbitisusedtoenabletheAEPfunction.

• AVPCTRL Register (Auto-Envelope Control Register)

BIT

NAME

—

SUMSEL

—

AEVMOD

—

SAVP

R/W

—

R/W

—

R/W

—

R/W

POR

—

Bit7

Dn:DividerValuefor40KHzor58KHzUltrasonicSensor

0:4-58KHzUltrasonicsensor

1:8-40KHzUltrasonicsensor

NotethatiftheUltrasonicsensorfrequencyis58KHz,thenthisbitmustbeselected

as"0",theaccumulatedvaluefromtheADDERwillbedividedby"4"beforeentering

theComparator.WhentheUltrasonicsensorfrequencyis40KHz,thisbeshouldbe

selectedas"1".

Bit6

Kn:KnValue

0:AccumulateADCconverteddata10timestoproduceanoutputADDOUT.

1:AccumulateADCconverteddata7timestoproduceanoutputADDOUT.

Bit5

Unimplemented

Bit4

SUMSEL:Comparatorinputpath,SUM,selection

0:SUMSEL=0,fromDivideroutput

1:SUMSEL=1,fromADCconverteddataoutput

Bit3

Unimplemented

Bit2

AEVMOD:Auto-EnvelopefunctionModeselection

0:Mode0

1:Mode1

InMode0,theComapartorValueisfromtheSUMCMPregisterandtheADC

converteddataortheDivideroutputdatawillbestoredintheFIFO.Whentheinput

datahasmorethan10sets,itwillgenerateaninterrupt.

InMode1,theComparatorValueisfromtheFIFOandthedesignershouldfillinthe

10-levelFIFOtocompareitwiththeinputsingalconverteddata.TheComparatorwill

fetchdataintheFIFOatan800KHzdatarate.Whena10-levelFIFOinterrupttakes

place,thedsignershouldre-enter10setsofdataintotheFIFO.

Bit1

Unimplemented

Bit0

SAVP:ActivateAuto-envelopeprocessor

0:Inactivate

1:Activate

WhentheSAVPbitisactivatedbytheapplication program, thewholeauto-

envelopeprocessingfunctionisstarted.ItwillactivatetheADCandSCFfunctions

simultaneously.

FIFO Operation

Thesedevicesprovidean10-levelFIFO.Whenthe10-LevelFIFOinterruptisenabledand10sets

ofdataarereceivedortransmitted,aninterruptwillbegenerated.Therearefiveregistersrelated

tothisFIFOoperation.TheFIFORD_ADDRregisterisusedtoindicatethecurrentreadaddress

andtheFIFOWR_ADDRisusedtoindicatethecurrentwriteaddressinFIFO.TheFIFOCTRL

registerisusedtocontroltheFIFOoperationandtoindicatetheFIFOstatus.Thedesignercanuse

thisregistertoinitialisetheFIFO,tostarttheFIFOoperationandtochecktheFIFIOstatus.The

followingoperatingdiagramillustratestheFIFOstructure.

HT45F39 Datasheet(PDF) 71 Page - Holtek Semiconductor Inc

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