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memory address register wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references toggle the table of contents memory address register 11 languages العربية deutsch español eesti français italiano 한국어 lombard монгол සිංහල ไทย edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia cpu register this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources memory address register news newspapers books scholar jstor july 2016 learn how and when to remove this message in a computer the memory address register mar 1 is the cpu register that either stores the memory address from which data will be fetched to the cpu registers or the address to which data will be sent and stored via system bus in other words this register is used to access data and instructions from memory during the execution phase of instruction mar holds the memory location of data that needs to be accessed when reading from memory data addressed by mar is fed into the mdr memory data register and then used by the cpu when writing to memory the cpu writes data from mdr to the memory location whose address is stored in mar mar which is found inside the cpu goes either to the ram random access memory or cache the mar register is half of a minimal interface between a microprogram and computer storage the other half is a mdr in general mar is a parallel load register that contains the next memory address to be manipulated for example the next address to be read or written references edit understanding the mar and the mdr www cs umd edu archived from the original on 2017 03 28 retrieved 2017 01 20 this computer hardware article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title memory_address_register oldid 1373872409 categories digital registers computer hardware stubs hidden categories articles with short description short description is different from wikidata articles needing additional references from july 2016 all articles needing additional references all stub articles this page was last edited on 8 september 2026 at 12 47 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents memory address register 11 languages add topic