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HOw to use external RAM(2MB) with pic18f series .. or AT89s52.

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sakender

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hi
i am working on project in which we are using EXternal RAM with controller....our main objective is to store data from serial port in RAM and then store it on micrSD card .one problm is that we have shortage of RAM as our data length is more then 4MB....plz help
 

If you don't have a parallel interface for ram, I would use SPI attached memory.
An example is the CY14B101P-SFXI, a 1 mbit sram part from Cypress. You can attach multiples of these on the same bus, or use some bigger parts.

Assuming you are using SPI for your SD card, these could hang off of the same bus.

You could also use I2C attached memory.

Just an idea.
Kent
 

The following ideas are only reference for you:
1.Split your store task into multi tasks.Each task operates data less than 2MB.
2.Replace the MCU,choose one which has parallel interface and has internal RAM and external RAM interface at least.
 

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