Lpc2000

If yopu want to clear bits 2&3 without changing any of the others do:

PINSEL2 = PINSEL2 & 0xfffffff3;
or 
PINSEL2 &= 0xfffffff3;

Dave S.

--- In lpc2000@yahoogroups.com, Jim Parziale <nuncio.bitis@g...> wrote:
> Oops - now I did it ...
> Is this what you really meant?
> 
>  PINSEL2 = PINSEL2 & ((1 << 2) | (1 << 3));
> 
> Even so, this clear all other bits...
> 
> On 8/2/05, Jim Parziale <nuncio.bitis@g...> wrote:
> > 
> > PINSEL2 = (PINSEL2 & (0 << 2) & (0 << 3));
> > 
> > According to this, you're clearing PINSEL2 altogether. Did you mean:
> > 
> > PINSEL2 = (PINSEL2 & (1 << 2) & (1 << 3));
> > 
> > On 8/2/05, soren_t_hansen <soren_t_hansen@y...> wrote:
> > > 
> > >  --- In lpc2000@yahoogroups.com, "Aalt Lokhorst" <lokhorst@s...>
wrote:
> > > > Hello Søren,
> > > > 
> > > > Not sure what processor you are using but I think you are diabling
> > > the JTAG by changing a JTAG line into a GPIO line.
> > > > 
> > > > I am using the LC2129 and the usermanual of this processor
shows the
> > > following:
> > > > 
> > > > Table 63: Pin Function Select Register 2 for LPC2119/2129/2194
> > > > (PINSEL2 - 0xE002C014)
> > > > 
> > > > 1:0 Reserved.
> > > > 
> > > > 2 When 0, pins P1.36:26 are used as GPIO pins.
> > > > When 1, P1.31:26 are used as a Debug port. (RTCK)
> > > > 
> > > > 3 When 0, pins P1.25:16 are used as GPIO pins.
> > > > When 1, P1.25:16 are used as a Trace port. (TRACESYNC)
> > > > 
> > > > 4:5 Reserved. Note: These bits must not be altered at any time.
> > > > Changing them may result in an incorrect code execution.
> > > > 
> > > > 6:31 Reserved.
> > > > 
> > > > According to this info you are disabling the JTAG RTCK line.
> > > > 
> > > > Hope this helps,
> > > > Aalt
> > > > 
> > > 
> > > Ups forgot to tell - it's a lpc2132 :o)
> > > 
> > > I use the following line and it still crashes:
> > > 
> > > PINSEL2 = (PINSEL2 & (0 << 2) & (0 << 3));
> > > 
> > > At the moment it isn't that big a deal, since the PINSEL2 bit 2
and 3
> > > are 0 at reset, and that's what I want them to be. It just pusled me
> > > that I couldn't write to those two bits whithout the MCU crashing.
> > > 
> > > /Søren
> > > 
> > 
> > 
> 
> 
> -- 
> ----------------------------------------------------------
> Jim Parziale
> Email: nuncio.bitis@g...
> Malden, MA
> ----------------------------------------------------------
> 
> 
> [Non-text portions of this message have been removed]