Lpc2000

Yes, it is possible to write bytes!
What you need to do, is to read the entire 16-bit word, modify the 
byte, (upper or lower), then write the entire 16-bit word back into 
the flash device.

Ken Wada

--- In lpc2000@yahoogroups.com, "smoutpatrick" <sonpat@b...> wrote:
>
> Ken,
> 
> We have selected a flash that supports page mode.
> However, the device doesn't support byte access.
> Is it nevertheless possible to write bytes with the help of the 
> compiler (i.e. the __packed type modifier)?
> 
> Thanks for your feedback,
> 
> Patrick
> 
> --- In lpc2000@yahoogroups.com, "Ken Wada" <kwada@a...> wrote:
> >
> > This is emminently doable...A few issues to concern your self 
> though:
> > 
> > 1.  Make sure you have boot-up code in your internal FLASH, (if 
you 
> > are using the LPC2214). With this boot-up code, you can setup your 
> > external memory parameters, (wait-states, burst mode params, 
> address 
> > decode etc).
> > 
> > 2.  If you are using a FLASH-less part, then you MUST use the 
> correct 
> > bus-width for the defaults for each memory bank..otherwise your 
> system 
> > will not work at all! Plus, you need to make sure you have some 
> boot 
> > code already resident on your external FLASH.
> > 
> > 3.  Make absolutely sure your BCFGn register is properly setup for 
> > external FLASH operation.
> > 
> > 4.  Your external FLASH will inherently run slower than the 
> internal 
> > FLASH. Therefore, get as much boost as possible by picking the 
> correct 
> > NOR-FLASH, and try as much as possible to get nibble-mode or burst 
> > mode...this will greatly improve the performance of your system 
> with 
> > little increases in the unit cost of your system.
> > 
> > 5.  Last but not least, make sure your hardware is wired up 
> properly..
> > .Byte select lines, chip select etc...
> > 
> > Ken Wada
> > 
> > --- In lpc2000@yahoogroups.com, "smoutpatrick" <sonpat@b...> 
wrote:
> > >
> > > Hi,
> > > 
> > > What would be the consequences if my hardware design based on 
the 
> > > LPC2214 uses 16 bit flash devices that only supports 16 bit 
> > accesses?
> > > Can I write bytes in the flash using the __packed type modifier?
> > > 
> > > Thanks for the feedback,
> > > 
> > > Patrick Smout
> > >
> >
>