 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT24LC128 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT24LC128 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
|
|
5 / 12 page  Rev. 1.10 5 March 12, 2015 HT24LC128 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 The128KEEPROMiscapableofa64-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 Fllow • Writeprotect The HT24LC128 device has a write-protect function.Programmingwillbeinhibitedwhenthe WPpinisconnectedtoVCC.Inthismode,the HT24LC128devicecanbeusedasaserialROM. Read Operations The HT24LC128 device supports three read operations,namely,currentaddressread,random address read and sequential read. During read operationexecution,theread/writeselectbitshould besetto“1”. • Currentaddressread Theinternaldatawordaddresscountermaintains thelastaddressaccessedduringthelastreador writeoperation,incrementedbyone.Thisaddress remainsvalidbetweenoperationsaslongasthe chippowerismaintained.Theaddresswillroll overduringareadfromthelastbyteofthelast memorypagetothefirstbyteofthefirstpage. Theaddresswillrolloverduringawritefrom thelastbyteofthecurrentpagetothefirstbyte ofthesamepage.Oncethedeviceaddresswith theread/writeselectbitsettooneisclockedin andacknowledgedbytheEEPROM,thecurrent addressdatawordisseriallyclockedout.The microcontrollerdoesnotrespondwithaninput zerobutgeneratesafollowingstopcondition(refer toCurrentreadtiming). |
|
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
