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HT48R068B Folha de dados(PDF) 86 Page - Holtek Semiconductor Inc

Nome de Peças HT48R068B
Descrição Electrónicos  Enhanced I/O 8-Bit OTP MCU
Download  118 Pages
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Fabricante Electrônico  HOLTEK [Holtek Semiconductor Inc]
Página de início  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B Folha de dados(HTML) 86 Page - Holtek Semiconductor Inc

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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
St ar t
Wr it e Sl av e
A ddr e ss to S IM A
SE T SI M[ 2: 0] =1 10
SE T SI ME N
I 2 C Bu s
In te rr up t= ?
Ye s
No
SE T EM FI a nd ES IM
Wa it f or In te rr upt
Go to M ai n Pr og ra m
CL R ES IM
Po ll S IM F to d ec i de
wh en t o go t o I 2 C Bu s IS R
Go to M ai n Pr og ra m
I2C Bus Initialisation Flow Chart
I2C Bus Start Signal
TheSTARTsignalcanonlybegeneratedbythemasterdeviceconnectedtotheI2Cbusandnotby
theslavedevice.ThisSTARTsignalwillbedetectedbyalldevicesconnectedtotheI2Cbus.When
detected,thisindicatesthattheI2CbusisbusyandthereforetheHBBbitwillbeset.ASTART
conditionoccurswhenahightolowtransitionontheSDAlinetakesplacewhentheSCLline
remainshigh.
Slave Address
ThetransmissionofaSTARTsignalbythemasterwillbedetectedbyalldevicesontheI2Cbus.
Todeterminewhichslavedevicethemasterwishestocommunicatewith,theaddressoftheslave
devicewillbesentoutimmediatelyfollowingtheSTARTsignal.Allslavedevices,afterreceiving
this7-bitaddressdata,willcompareitwiththeirown7-bitslaveaddress.Iftheaddresssentoutby
themastermatchestheinternaladdressofthemicrocontrollerslavedevice,thenaninternalI2Cbus
interruptsignalwillbegenerated.Thenextbitfollowingtheaddress,whichisthe8thbit,defines
theread/writestatusandwillbesavedtotheSRWbitoftheSIMC1register.Theslavedevicewill
thentransmitanacknowledgebit,whichisalowlevel,asthe9thbit.Theslavedevicewillalsoset
thestatusflagHAASwhentheaddressesmatch.
AsanI2Cbusinterruptcancomefromtwosources,whentheprogramenterstheinterrupt
subroutine,theHAASbitshouldbeexaminedtoseewhethertheinterruptsourcehascomefrom
amatchingslaveaddressorfromthecompletionofadatabytetransfer.Whenaslaveaddressis
matched,thedevicemustbeplacedineitherthetransmitmodeandthenwritedatatotheSIMD
register,orinthereceivemodewhereitmustimplementadummyreadfromtheSIMDregisterto
releasetheSCLline.


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