read voltage on pin mcb2300

Dear All,

I have a mcb2300 board with LPC2378. I want to read the voltage with Test Multimeter from PIN0.0. I read from Document that this pin corresponds to the PIN 66 on the board. So I set pin 66 with this code:

PINSEL0 |= 0x00000000;

but I read on the Test Multimeter 4.66 voltage.

Why no 0 volts?

Thanks

Miky