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Access time for SD card

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mehtadhaval

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I am trying to access SD card with P89V664 (8051 based controller with 2kB RAM and 64kb flash).

Can anyone help me?

Also, what is the fastest access time for single byte, because I need a very low access time....
 

kj.singh

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The NXP controller you are using must have a SPI interface. Just get the spec of SD card from web and hook up the SD card pins to the uC. Initialize the SPI interface at a slow clock rate 1-2MHz first (will be easy to debug).
At the max. you can expect 20usec of access time for the first byte and it should come down to say about 200nsec for the remaining sector.
 

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