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HT24LC256 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT24LC256 Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 12 page  Rev. 1.00 4 January 29, 2013 HT24LC256 Write Operations • Bytewrite A write operation requires two data word addressesfollowingthedeviceaddresswordand acknowledgment.Uponreceiptofthisaddress, the EEPROM will again respond with a zero andthenclockinthefirst8-bitdataword.After receivingthe8-bitdataword,theEEPROMwill outputazeroandtheaddressingdevice,suchasa microcontroller,mustterminatethewritesequence withastopcondition.AtthistimetheEEPROM willexecuteaninternally-timedwritecycleto thenon-volatilememory.Allinputsaredisabled duringthiswritecycleandtheEEPROMwillnot responduntilthewriteoperationiscompleted(refer toBytewritetiming). • Pagewrite The256KEEPROMiscapableofa64-bytepage write.Apagewriteisinitiatedinthesamewayas abytewrite,butthemicrocontrollerdoesnotsend astopconditionafterthefirstdatawordisclocked in.Instead,aftertheEEPROMacknowledgesthe receiptofthefirstdataword,themicrocontroller can transmit up to 63 more data words.The EEPROMwillrespondwithazeroaftereachdata wordreceived.Themicrocontrollermustterminate thepagewritesequencewithastopcondition (refertoPagewritetiming).Thedatawordaddress lower6bitsareinternallyincrementedfollowing thereceiptofeachdataword.Thehigherdata wordaddressbitsarenotincremented,retaining thememorypagerowlocation.Whentheword address,internallygenerated,reachesthepage boundary,thefollowingbyteisplacedatthe beginningofthesamepage.Ifmorethan64data wordsaretransmittedtotheEEPROM,thedata wordaddresswill“rollover”andpreviousdata willbeoverwritten. • Acknowledgepolling Tomaximizebusthroughput,onetechniqueisto allowthemastertopollforanacknowledgesignal afterthestartconditionandthecontrolbytefora writecommandhasbeensent.Ifthedeviceisstill busyimplementingitswritecycle,thennoACK willbereturned.Themastercansendthenext read/writecommandwhentheACKsignalhas finallybeenreceived. 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 C ont ro l By te wi th R /W =0 (A CK =0 )? Ne x t O per at io n No Ye s Acknowledge Polling Timing • Writeprotect The HT24LC256 device has a write-protect function.Programmingwillbeinhibitedwhenthe WPpinisconnectedtoVCC.Inthismode,the HT24LC256devicecanbeusedasaserialROM. De vi ce A ddr es sF ir st W or d Ad dr es s (n ) SD A Li ne A2 A1 A0 Se co nd W or d Ad dr es s (n ) Da ta ( n+ x) Da ta ( n) No te : * = Do n' t ca re b it s Page Write Timing De vi ce A ddr es sF ir s t W or d Ad dr es s SD A Li ne A2 A1 A0 Se co nd W or d Ad dr es s Da ta Byte Write Timing |
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