Lpc2000

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
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E-mail: Lokhorst@...
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