Holtek HT66F30 User Manual

Rev. 2.50 196 June 22, 2017 Rev. 2.50 197 June 22, 2017
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
Bit0 RXAK:I
2
CBusReceiveacknowledgeag
0:Slavereceiveacknowledgeag
1:Slavedonotreceiveacknowledgeag
TheRXAKagisthereceiveracknowledgeag.WhentheRXAKagis0,itmeans
thataacknowledgesignalhasbeenreceivedatthe9thclock,after8bitsofdatahave
beentransmitted.Whentheslavedeviceinthetransmitmode,theslavedevicechecks
theRXAKagtodetermineifthemasterreceiverwishestoreceivethenextbyte.The
slavetransmitterwillthereforecontinuesendingoutdatauntiltheRXAKagis1.
Whenthisoccurs,theslavetransmitterwillreleasetheSDAlinetoallowthemasterto
sendaSTOPsignaltoreleasetheI
2
CBus.
TheSIMDregisterisusedtostorethedatabeingtransmittedandreceived.Thesameregisterisused
byboththeSPIandI
2
Cfunctions.BeforethedevicewritesdatatotheI
2
Cbus,theactualdatato
betransmittedmustbeplacedintheSIMDregister.AfterthedataisreceivedfromtheI
2
Cbus,the
devicecanreaditfromtheSIMDregister.AnytransmissionorreceptionofdatafromtheI
2
Cbus
mustbemadeviatheSIMDregister.
• SIMD Register
Bit 7 6 5 4 3 2 1 0
Name
D7 D6 D5 D4 D3 D2 D1 D0
R/W R/W R/W R/W R/W R/W R/W R/W R/W
POR × × × × × × × ×
“×” unknown
• SIMA Register
Bit 7 6 5 4 3 2 1 0
Name IICA6 IICA5 IICA4 IICA3 IICA2
IICA1 IICA0 —
R/W R/W R/W R/W R/W R/W R/W R/W —
POR × × × × × × × —
“×” unknown
Bit7~1 IICA6~IICA0:I
2
Cslaveaddress
IICA6~IICA0istheI
2
Cslaveaddressbit6~bit0.
TheSIMAregisterisalsousedbytheSPIinterfacebuthasthenameSIMC2.The
SIMAregisteristhelocationwherethe7-bitslaveaddressoftheslavedeviceis
stored.Bits7~1oftheSIMAregisterdefinethedeviceslaveaddress.Bit0isnot
dened.
Whenamasterdevice,whichisconnectedtotheI
2
Cbus,sendsoutanaddress,which
matchestheslaveaddressintheSIMAregister,theslavedevicewillbeselected.Note
thattheSIMAregisteristhesameregisteraddressasSIMC2whichisusedbytheSPI
interface.
Bit0 Undenedbit
Thisbitcanbereadorwrittenbyusersoftwareprogram.

Holtek HT66F30 Specifications

General

Brand	Holtek
Model	HT66F30
Category	Computer Hardware
Language	English