HT45F75 datasheet(143/190 Pages) HOLTEK

143 / 190 page

Rev. 1.10

1��

De�e��e� 1�� 01�

Rev. 1.10

1�3

De�e��e� 1�� 01�

HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Address Detect Mode

SettingtheAddressDetectModebit,ADDEN,intheUCR2register,enablesthisspecialmode.If

thisbitisenabledthenanadditionalqualifierwillbeplacedonthegenerationofaReceiverData

Availableinterrupt,whichisrequestedbytheRXIFflag.IftheADDENbitisenabled,thenwhen

dataisavailable,aninterruptwillonlybegenerated,ifthehighestreceivedbithasahighvalue.

NotethattheMFnE,UIEandEMIinterruptenablebitsmustalsobeenabledforcorrectinterrupt

generation.Thishighestaddressbitisthe9thbitifBNO=1orthe8thbitifBNO=0.Ifthisbit

ishigh,thenthereceivedwordwillbedefinedasanaddressratherthandata.ADataAvailable

interruptwillbegeneratedeverytimethelastbitofthereceivedwordisset.IftheADDENbit

isnotenabled,thenaReceiverDataAvailableinterruptwillbegeneratedeachtimetheRXIF

flagisset,irrespectiveofthedatalastbitstatus.Theaddressdetectmodeandparityenableare

mutuallyexclusivefunctions.Thereforeiftheaddressdetectmodeisenabled,thentoensurecorrect

operation,theparityfunctionshouldbedisabledbyresettingtheparityenablebittozero.

ADDEN

Bit 9 if BNO=1,

Bit 8 if BNO=0

UART Interrupt Generated

√

ADDEN Bit Function

UART Module Power Down and Wake-up

WhentheMCUsystemclockisswitchedoff,theUARTwillceasetofunction.IftheMCUexecutes

the“HALT”instructionandswitchesoffthesystemclockwhileatransmissionisstillinprogress,

thenthetransmissionwillbepauseduntiltheUARTclocksourcederivedfromthemicrocontroller

isactivated.Inasimilarway,iftheMCUexecutesthe“HALT”instructionandswitchesoffthe

systemclockwhilereceivingdata,thenthereceptionofdatawilllikewisebepaused.Whenthe

MCUenterstheIDLEorSLEEPMode,notethattheUSR,UCR1,UCR2,transmitandreceive

registers,aswellastheBRGregisterwillnotbeaffected.Itisrecommendedtomakesurefirstthat

theUARTdatatransmissionorreceptionhasbeenfinishedbeforethemicrocontrollerentersthe

IDLEorSLEEPmode.

TheUARTfunctioncontainsareceiverRXpinwake-upfunction,whichisenabledordisabled

bytheWAKEbitintheUCR2register.Ifthisbit,alongwiththeUARTenablebit,UARTEN,the

receiverenablebit,RXENandthereceiverinterruptbit,RIE,areallsetbeforetheMCUentersthe

IDLE0orSLEEPMode,thenafallingedgeontheRXpinwillwakeuptheMCUfromtheIDLE0

orSLEEPMode.Notethatasittakescertainsystemclockcyclesafterawake-up,beforenormal

microcontrolleroperationresumes,anydatareceivedduringthistimeontheRXpinwillbeignored.

ForaUARTwake-upinterrupttooccur,inadditiontothebitsforthewake-upbeingset,theglobal

interruptenablebit,EMI,andtheUARTinterruptenablebit,UIE,mustalsobeset.Ifthesetwobits

arenotsetthenonlyawakeupeventwilloccurandnointerruptwillbegenerated.Notealsothat

asittakescertainsystemclockcyclesafterawake-upbeforenormalmicrocontrollerresumes,the

UARTinterruptwillnotbegenerateduntilafterthistimehaselapsed.

HT45F75 Datasheet(PDF) 143 Page - Holtek Semiconductor Inc

HT45F75 Datasheet(HTML) 143 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 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL