 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
HT24LC256 датащи(PDF) 3 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT24LC256 датащи(HTML) 3 Page - Holtek Semiconductor Inc |
|
|
3 / 12 page  Rev. 1.00 3 January 29, 2013 HT24LC256 Functional Description Pin Function • Serialclock–SCL ThepositiveedgeoftheSCLinputisusedtoclock dataintotheEEPROMdevice.Thenegativeedge isusedtoclockdataoutofthedevice. • Serialdata–SDA The SDA pin is bidirectional for serial data transfer.Thepinisopendraindrivenandmaybe wired-ORwithanynumberofotheropendrainor opencollectordevices. • AddressInputs–A0,A1,A2 TheA2,A1andA0pinsaredeviceaddressinputs thatarehardwiredorleftnotconnected.Whenthe pinsarehardwired,asmanyaseight256Kdevices maybeaddressedonasinglebussystem(device addressingisdiscussedindetailundertheDevice Addressingsection).Theseinputsmustbetiedto VCCorVSS,toestablishthedeviceselectcode. • Writeprotect–WP Thedevicehasawriteprotectpinthatprovides hardwaredataprotection.Thewriteprotectpin allowsnormalread/writeoperationsconnectedto ground.Whenthewriteprotectpinisconnectedto VCC,thewriteprotectionfeatureisenabledand operatesasshowninthefollowingtable. WP Pin Status Protect Array VCC Full Array – 256K VSS or floating Normal Read/Write Operations Memory Structure Thedeviceisinternallystructuredinto32K8-bit words.A15-bitdatawordaddressisrequiredfor wordaddressing. Device Operation • Clockanddatatransition Datatransfermaybeinitiatedonlywhenthebus isnotbusy.Duringdatatransfer,thedataline mustremainstablewhenevertheclocklineis high.Changesinthedatalinewhiletheclockline ishighwillbeinterpretedasaSTARTorSTOP condition. • Startcondition Ahigh-to-lowtransitionofSDAwithSCLhigh isastartconditionwhichmustprecedeanyother command (refer to Start and Stop Definition Timingdiagram). • Stopcondition Alow-to-hightransitionofSDAwithSCLhighis astopcondition.Afterareadsequence,thestop commandwillplacetheEEPROMinastandby powermode(refertoStartandStopDefinition TimingDiagram). • Acknowledge All addresses and data words are serially transmittedtoandfromtheEEPROMin8-bit words.TheEEPROMsendsazerotoacknowledge thatithasreceivedeachword.Thishappensduring theninthclockcycle. SDA SCL Data allowed to change Start condition Stop condition No ACK state Address or acknowledge valid Start and Stop Definition Timing diagram Device Addressing The256KEEPROMdevicerequiresan8-bitdevice addresswordfollowingastartconditiontoenablethe chipforareadorwriteoperation.Thedeviceaddress wordconsistsofamandatoryone,zerosequencefor thefirstfourmostsignificantbits(refertothediagram showingtheDeviceAddress).Thisiscommontoall theEEPROMdevices. The256KEEPROMusesthethreedeviceaddress bitsA2,A1,A0toallowasmanyaseightdevices onthesamebus.Thesebitsarecomparedtotheir correspondinghardwiredinputpins. The8thbitdeviceaddressistheread/writeoperation selectbit.Areadoperationisinitiatedifthisbitis highandawriteoperationisinitiatedifthisbitislow. Ifthecomparisonofthedeviceaddressissuccessful, theEEPROMwilloutputazeroACKbit.Ifnot,the devicewillreturntothestandbystate. 10 A2 A1 A0 10 De vi ce A dd re ss R/ W Device Adress |
|
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
