Hi Erik,

Thank for the answer. This message was posted in FM forum. But I receive another suggestion. "Try 8052.com forum.". This question is also in Philips mcu forum.
So, I'm here.

I'm using FM Version 3.61.230. ICP bridge using LPC921. The Bridge's firmware was adaptated for this lpc. Code bridge version is 1.7.
I have others pins that work fine before and after program lock bit. (p1.4,p0.3)
I program the LPC915 with my code and the lock bit 0 (bank 0 and bank 1) in FM, selected.

Your comment was very important !

My program receive a analogic signal in P0.2 (input comparator). The reference voltage is generated by D/A converter in P0.4 pin.
If the signal in P0.2 is high than P0.4, a LED in P0.1 is turn on and the level in P1.0 is high, else, the LED is turn off and the level in P1.0 is low.

So, when I program the lock bit 0 in bank 0 and 1,disable reading, the reference voltage generated by D/A converter in P0.4 pin stop to work !!

Well, now I know why those pins stopped to work. The lock bit 0 doesn't allows my program read the table. This table is used by D/A converter to generate the level voltage.

I will allocate the table on another area. The result will be posted here.

thank you !
Jorge