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how to interface 64K Parallel EEPROM & 32K RAM with 89C5
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starlet



Joined: 12 Jun 2003
Posts: 23
Post26 Dec 2003 18:21   

how to interface 64K Parallel EEPROM & 32K RAM with 89C5
hi friends

i want to interface 64KB Parallel EEPROM (storing data not code) and 32KB Parallel RAM with 89c55 instructions MOVX. how to do it. 89c55 has 16bits address which is also equal to eeprom address where to connect RAM. or with decoder ......
what to do.
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dinhkhoa



Joined: 19 Nov 2003
Posts: 4
Post27 Dec 2003 5:36   

Re: how to interface 64K Parallel EEPROM & 32K RAM with
starlet wrote:
hi friends

i want to interface 64KB Parallel EEPROM (storing data not code) and 32KB Parallel RAM with 89c55 instructions MOVX. how to do it. 89c55 has 16bits address which is also equal to eeprom address where to connect RAM. or with decoder ......
what to do.


you can use one bit port pin of 89c55 to decoder address for ROM and RAM .exp: P1.1 connect to pin /CS of rom and pin CS of ram.to access rom you clr P1.1, to access ram you set P1.1...you can see more at:
http://www.atmel.com./dyn/resources/prod_documents/DOC0510.PDF
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