This is probably a really dumb question, but you have to start somewhere. I want to use the masked access feature on the LPC1343.
Right now I am using this code to write to all of the bits.
LPC_GPIO1->DATA = 0x00000FFF; // Turn on all leds which the address of the register is 0x5001 3FFC
If I only wanted to mask some of the bits how do you point to a different address such as 0x5001 3FF0 which would mask off PIO1_0 and PIO1_1?