Assembly? LD & MOV

Question

What's the difference between that instructions? By example in the ARM9 processor, it shouldn't be:

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ASM: mov r0, 0
C: r0 = 0;

ASM: ld r0, 0
C: r0 = 0;

?

I don't know why to use one or other :S

Answer 1

It must be:

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ASM: mov r0, 0
C:   r0 = 0;

ASM: ld r0, 0
C:   r0 = *(pc + 0);

Check out this reference card, must have if you're developing for ARM on ASM.