Lpc2000

---- Original Message ----
From: "blasteriokas" <blasteriokas@...>
To: <lpc2000@yahoogroups.com>
Sent: Saturday, February 11, 2006 11:32 AM
Subject: [lpc2000] Trouble with LPC2148 P0.2 and P0.3 pins

> I am having problems with P0.2 and P0.3 pins.
> The trouble is that I can't define them as outputs. I have wrote a
> small program:
>
> #include <LPC214x.H>
> void main(void)
> {
>    PINSEL0 = 0;
>    IODIR0 = 0xFFFC;
>    IOPIN0 = 0x00FC;
>    PCON = 1;         // IDLE mode
> }
>
> When program is executed, on pins P0.4..15 is logical '1', but on
> these P0.2 and P0.3 - nothing. I connected a pull-up resistor to Vcc -
> pins does not refuse it, so, I think, these two pins works like
> inputs. But WHY?

Read the pin descriptions in the datasheet or manual, including the 
footnotes.  They are open drain.

Karl Olsen