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Increase memory size

Increase memory size

Increase memory size

(OP)
I'm designing a microcontroller embedded system using P89C51RC2 (8051 based with 4 i/o ports (8 bits)). I need to have a least 1 to 8 Mbytes of external memory for data storage. How can I do it at the lowest cost?
What type of memory shall i use? EEprom, CompactFlash, etc?


- I do not like to use too many address lines. I have 2 8bit ports used for LCD and keypads already.  Can I use i2c interface? any suggestion for 1 to 8Mbytes memory expansion is welcome. Hopefully i do not need to use a 16bit controller.

RE: Increase memory size

Hi, you are way out of a 8051's address range, whilst it is possible it would be very unsatisfactory. You need a micro with a 24bit address range. What kind of memory you need depends on your access requirements.

RE: Increase memory size

(OP)
Hi! Thanks for the input. Just found serial flash of 4Mbits (potential of 64Mb). http://www.nexflash.com/html/
Think I'm heading the right direction.   

RE: Increase memory size

haolian,

to my mind you are on the right approach as long as you do not need to access your data with ahigh data rate. If speed is important I would suggest to follow chbarn24050 suggestion.

RE: Increase memory size

Atmel also has the "dataflash" which can go up to 128MB.  Check if it can second-source your nexflash part.  Or make a double overlapping footprint on your pcb, to make sure that you're not caught with a parts shortage.

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