Lpc2000

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