Lpc2000

Yes, it's possible...but some people could not agree about 
the "instantaneous"...;-))
--- In lpc2000@yahoogroups.com, "Aalt Lokhorst" <lokhorst@s...> 
wrote:
> Hello All,
> 
> In the Philips document 'UM_LPC21XX_LPC22XX_2.pdf' on page 137 I 
read:
> 
>    Applications that require instanatneous appearance of zeros and 
ones
>    on the respected parallel port can use direct access to port's
>    corresponding GPIO Pin Value Register (IOPIN).
>    Assuming that pins P0.8 to P0.15 are configured as output, 
write to 
>    IO0PIN:
> 
>      IO0PIN = 0x0000 C700
> 
>    will produce the same output as following sequence of writes:
> 
>      IO0SET = 0x0000 C700
>      IO0CLR = 0x0000 3800
> 
>    Solution utilizing access to IO0SET and IO0CLR will take more 
steps
>    compared to a single IO0PIN write access.
> 
> The same document shows on page 135 that IO#PIN is a ReadOnly 
register.
> 
> Am I missing something, how can you write to a ReadOnly register?
> 
> Best Regards,
> 
> -- ==============================
> Aalt Lokhorst
> Schut Geometrische Meettechniek bv
> Duinkerkenstraat 21
> 9723 BN Groningen
> P.O. Box 5225
> 9700 GE Groningen
> The Netherlands
> Tel: +31-50-5877877
> Fax: +31-50-5877899
> E-mail: Lokhorst@S...
> ==============================