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HT2201 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT2201 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 9 page  Rev. 1.40 5 January 16, 2014 HT2201 S end W ri te C om m and S end St op C ondi ti on to I ni ti at e Wr it e Cy cl e S end St ar t Se nd Co tr ol l By te wi th R /W =0 (A CK =0 )? Ne x t O per at io n No Ye s Acknowledge Polling Flow • Currentaddressread Theinternaldatawordaddresscountermaintains thelastaddressaccessedduringthelastreador writeoperation,incrementedbyone.Thisaddress staysvalidbetweenoperationsaslongasthechip powerismaintained.Theaddressrolloverduring readfromthelastbyteofthelastmemorypageto thefirstbyteofthefirstpage.Theaddressrollover duringwritefromthelastbyteofthecurrentpage tothefirstbyteofthesamepage.Oncethedevice addresswiththeread/writeselectbitsettooneis clockedinandacknowledgedbytheEEPROM, thecurrentaddressdatawordisseriallyclocked out.ThemicrocontrollershouldrespondaNo ACK(High)signalandfollowingstopcondition (refertoCurrentreadtiming). • Randomread Arandom read requires a dummy byte write sequencetoloadinthedatawordaddresswhich is then clocked in and acknowledged by the EEPROM.Themicrocontrollermustthengenerate another start condition.The microcontroller nowinitiatesacurrentaddressreadbysending adeviceaddresswiththeread/writeselectbit high.TheEEPROMacknowledgesthedevice addressandseriallyclocksoutthedataword.The microcontrollershouldrespondwitha"noACK" signal(high)followedbyastopcondition.(refer toRandomreadtiming). • Sequentialread Sequentialreadsareinitiatedbyeitheracurrent addressreadorarandomaddressread.Afterthe microcontrollerreceivesadataword,itresponds withanacknowledgment.AslongastheEEPROM receivesanacknowledgment,itwillcontinueto incrementthedatawordaddressandseriallyclock outsequentialdatawords.Whenthememory addresslimitisreached,thedatawordaddresswill rolloverandthesequentialreadcontinues.The sequentialreadoperationisterminatedwhenthe microcontrollerrespondswitha"noACK"signal (high)followedbyastopcondition. |
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