Lpc2000

Flash bits can only be written to '0'. They erase to a '1' state. 
Therefore unless you are only changing a couple of bits to '0' you MUST 
erase flash everytime before reprogramming it.

Al

Leighton Rowe wrote:

> 
> Concerning Philips Apps' post on Partial Flash Programming I
> understand lpc flash memory can be updated 128 bits (minimum) at a
> time, and that a each 4K area can be written 16 times (max).
> 
> (http://groups.yahoo.com/group/lpc2000/message/2681)
> 
> However, I'm currently having trouble updating 128-bit (quadword
> aligned) locations in flash memory. The first write always
> show up OK (as long as the location has all 1's), but on the 2nd
> write (on the same location) results in some bit(s) not displaying
> correctly.
> 
> Is it possible for me to re-write a 128-bit (quadword aligned) flash
> locations? Or must I erase the flash location first? I can do the
> second question, but I'm a little confused about how often flash
> bits can change without an erase.
> 
> best regards,
> Leighton
> 
> 
> 
> 
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