Is it Possible to rewrite single word in flash

[MCF52233]

Hi ,

is it possible to rewrite single word in flash??

Suppose we write single word already now we have to again

rewrite this word , so is there any way (might be) to rewrite the word

without erasing flash ??

[FridgeFreezer]

If you have the space to spare, you can add a flag to the data that indicates it's no longer valid, and the code then looks at the next location in flash for a more recently written value. When the block is full, you need to erase and start again at the bottom.

[tkvenki]

Hi,

As far as I know, 

Flash bits can be changed from 1->0 but not from 0->1, without an Erase.

Our flash writing algorithm works as follows:

1. Map a sector to RAM.

2. Erase FLash

3. CHange Data in RAM image...

4. Write the RAM sector image to Flash ...

This turns out to be a very slow process.

If you have a better algorithm, let me know...

[MCF52233]

Hi ,

Thanks for ur response.

I also follow the same Algorithm n guessing if someone have better than this as use of this algorithm

uses more RAM which is very precious for me.