Lpc2000

On Wednesday 03 May 2006 14:19, Jan Thogersen wrote:
> How come it takes 3 instruction to load the correct address into r2.
> First it moves #0xE0000000 to r2, then adds #0x00004000 and finally adds
> #0x00000018 to end up with #0xE0004018 which is the address of T0MR0.
> But why don't it just move #0xE0004018 into the r2 in the first
> instruction?

You can't have an opcode + 32-bit operand when your instruction is only 32-bit 
wide. Move immediate takes a 12-bit operand, consisting of an 8-bit value and 
a 4-bit rotating constant, allowing you to shift the 8-bit to any even bit 
location.

Regards,

Dominic