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HT66F20 Datasheet(PDF) 196 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 196 Page - Holtek Semiconductor Inc |
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196 / 298 page  Rev. 1.90 196 �e���a�� 18� �01� Rev. 1.90 197 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM SIMC1 Register Bit 7 6 5 4 3 2 1 0 Name HC� HAAS HBB HTX TXAK SRW IAMWU RXAK R/W R R R R/W R/W R R/W R POR 1 0 0 0 0 0 0 1 Bit7 HCF:I2CBusdatatransfercompletionflag 0:Dataisbeingtransferred 1:Completionofan8-bitdatatransfer TheHCFflagisthedatatransferflag.Thisflagwillbezerowhendataisbeing transferred.Uponcompletionofan8-bitdatatransfertheflagwillgohighandan interruptwillbegenerated. Bit6 HAAS:I2CBusaddressmatchflag 0:Notaddressmatch 1:Addressmatch TheHAASflagistheaddressmatchflag.Thisflagisusedtodetermineiftheslave deviceaddressisthesameasthemastertransmitaddress.Iftheaddressesmatchthen thisbitwillbehigh,ifthereisnomatchthentheflagwillbelow. Bit5 HBB:I2CBusbusyflag 0:I2CBusisnotbusy 1:I2CBusisbusy TheHBBflagistheI2Cbusyflag.Thisflagwillbe1whentheI2Cbusisbusywhich willoccurwhenaSTARTsignalisdetected.Theflagwillbesetto0whenthebusis freewhichwilloccurwhenaSTOPsignalisdetected. Bit4 HTX:SelectI2Cslavedeviceistransmitterorreceiver 0:Slavedeviceisthereceiver 1:Slavedeviceisthetransmitter Bit3 TXAK:I2CBustransmitacknowledgeflag 0:Slavesendacknowledgeflag 1:Slavedonotsendacknowledgeflag TheTXAKbitisthetransmitacknowledgeflag.Aftertheslavedevicereceiptof8-bits ofdata,thisbitwillbetransmittedtothebusonthe9thclockfromtheslavedevice. TheslavedevicemustalwayssetTXAKbitto0beforefurtherdataisreceived. Bit2 SRW:I2CSlaveRead/Writeflag 0:Slavedeviceshouldbeinreceivemode 1:Slavedeviceshouldbeintransmitmode TheSRWflagistheI2CSlaveRead/Writeflag.Thisflagdetermineswhether themasterdevicewishestotransmitorreceivedatafromtheI2Cbus.Whenthe transmittedaddressandslaveaddressismatch,thatiswhentheHAASflagissethigh, theslavedevicewillchecktheSRWflagtodeterminewhetheritshouldbeintransmit modeorreceivemode.IftheSRWflagishigh,themasterisrequestingtoreaddata fromthebus,sotheslavedeviceshouldbeintransmitmode.WhentheSRWflag iszero,themasterwillwritedatatothebus,thereforetheslavedeviceshouldbein receivemodetoreadthisdata. Bit1 IAMWU:I2CAddressMatchWake-upControl 0:Disable 1:Enable-mustbeclearedbytheapplicationprogramafterwake-up Thisbitshouldbesetto1toenabletheI2CaddressmatchwakeupfromtheSLEEP orIDLEMode.IftheIAMWUbithasbeensetbeforeenteringeithertheSLEEPor IDLEmodetoenabletheI2Caddressmatchwakeup,thenthisbitmustbeclearedby theapplicationprogramafterwake-uptoensurecorrectiondeviceoperation. |
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