HT45F39 datasheet(78/102 Pages) HOLTEK

78 / 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

ThefollowingistheAutoIDSettingprocedurefortheUltrasonicSensormodule:

• BeforetheUltrasonicSensormoduleisconnectedtotheBus,asthereisnoIDinthismodulethe

setupoftheBusControlUnithastobeIOCNT=0.

WhentheIOCNTbitisclearedto"0",itwilldisconnectthePA2toPA7path.Then,the

HT45F39/HT45F391willstarttosendanIDrequesttotheHostthroughPA7.Allthemodules

whichhavenoIDinthemimplementthesamesettingandsendanIDrequesttothehost.The

PA7hastobesetupasanoutputpintotransmitanIDrequestandsetupasinputpinwhentheID

requestistransmittedcompletely.

• WhentheHT45F39/HT45F391(1)isconnectedtotheBUS,theHOSTwillreceiveanIDrequest

fromtheHT45F39/HT45F391(1)andsendacorrespondingIDtoit.TheIDwillbereceivedby

thePA7pin.

• WhentheHT45F39/HT45F391(1)receivestheID,ithastosetIOCNT=1tosetthepath,PA2to

PA7,fortheHT45F39/HT45F391(2).

• WhentheHT45F39/HT45F391(2)isconnectedtotheBUS,followingstep1andstep2,anID

willbesenttoitbythePA7inputpinfromtheHOST.

• WhentheHT45F39/HT45F391(2)hasreceivedtheID,ithastosetIOCNT=1,tosetthepathfor

anothermodule.

• WhenallthemoduleshavereceviedthecorrespondingIDs,thenwhentheHOSTsendsacom-

havereceviedthecorrespondingIDs,thenwhentheHOSTsendsacom-

thecorrespondingIDs,thenwhentheHOSTsendsacom-

thenwhentheHOSTsendsacom-

whentheHOSTsendsacom-

mand,allthemodules,namelyHT45F39/HT45F391(n),willreceiveitatthesametimeand

checkifthecommandismatched.

• IftheIDismatched,theHT45F39/HT45F391hastosetIOCNT=1andthensendaResponse

commandtotheHOSTthroughthePA7outputpin.

• WhentheResponsecommandissentcompletely,alloftheHT45F39/HT45F391devicesinthe

modulesshouldsetIOCNT=1towaitthenextcommandfromtheHOST.

HT45F39 Datasheet(PDF) 78 Page - Holtek Semiconductor Inc