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seemanta
Joined: 10 Jun 2006
Posts: 64
Helped: 2
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 24 Jun 2008 15:11 Which ROM IC to use for interfacing with AT89S52? |
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Hi,
I have never used an AT89S52 with external 64K code memory. Can you please suggest which IC would be the best one?
I only need external code memory as the internal RAM would be sufficient for my purpose.
The only criteria I am looking for is ease of programming the ROM chip. I cannot afford to buy myself an expensive programmer and hope to create my own home brewed ROM programmer.
Please advise.
regards,
Seemanta
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ckshivaram
Joined: 21 Apr 2008
Posts: 323
Helped: 22
Location: korea
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| 24 Jun 2008 15:42 Re: Which ROM IC to use for interfacing with AT89S52? |
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| Atmel AT24C64
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laktronics
Joined: 06 Jan 2007
Posts: 833
Helped: 137
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| 26 Jun 2008 13:32 Re: Which ROM IC to use for interfacing with AT89S52? |
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Hi Seematha,
The only way to use as external code memory is to use parallel EEPROM/ Battery backed up RAM or EPROM and use PSEN to read the memory. You will need an LS/HC373 like device to separate low byte address and data bus for connection to the EEPROM/EPROM. Serial devices will not work for this application as they have to be bus compatible with 8051.
If any further doubts, please continue.
Regards,
Laktronics
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