Lpc2000

I'm new to ARM / embedded / Philips. I've got some code that I've been
stepping through and one instruction is causing a data abort, I think,
since execution goes to 0x00000010 (the data abort vector). But core
interrupts are disabled. I guess that a data abort is not really an
interrupt. But what could cause this to happen?

on the MCB2130 / LPC2138:

r0 =    0x00000000
r1 =    0x4000f6f4
cpsr =	0x800000df
pc =	0x400000b4

strcc   r0, [r1], #4    <<<< causes 'data abort', goes to 0x00000010

thanks,
David