Lpc2000

--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> wrote: 
> In case of the LPC2114/2124 part, the one you are working with, the 
> IOPIN register described in the "Table 68: GPIO Register Map" 
> ("LPC2114/2124/2212/2214 User Manual", page 110, February 03, 2004 
> edition) refers to IOPIN as "GPIO Port Pin value register", and not 
> to the "Port Pin value…" in general. More detailed description of
> the same register (page 111), starts with: 
> 
> "This register provides the value of the GPIO pins…"
> 
> Therefore, IOPIN reflects any outside world influence on the GPIO 
> configured pins only!

This may very well be the way the hardware works (and I will take
your word for it).  But claiming that this is what the documentation
says is baloney.  Try reading page 110.  I quote (capitalized emphasis
is mine):

IOPIN:  .... The current state of the port pins can always be read
         from this register, REGARDLESS OF PIN DIRECTION OR MODE.

> This is the way all ports in Philips LPC2000 family of
> microcontrollers are designed to operate. 
> 
> Hope this clarifies the subject of GPIO pins. 

It clarifies it for me.  But that won't help the next person who
downloads the documentation, and believes it is accurate.

    -bob