Prefetch Abort (PAbt) after Entering Idle (Help!)

Part: LPC222x

Hi,

I am experiencing a Prefetch Abort after entering Idle mode via setting the IDL bit in PCON.

Where I normally would run this:

StartTimerInterrupts();

while (1)
{
 // Check If Timers Have Set Variables, Do Stuff
 DoWorkloop();
}

I am trying to do this:

StartTimerInterrupts();

while (1)
{
 // Check If Timers Have Set Variables, Do Stuff
 DoWorkloop();

 // Sleep Until Timers Wake Me Up
 PCON |= 0x01;
}

I experience a Prefetch Abort and now am stuck as to how to debug this.

Please see my registers here:

ieee.usask.ca/.../Registers.png
ieee.usask.ca/.../Registers-2.png

Thanks!
-Chris

IDE-Version:
µVision3 V3.31
Copyright (c) Keil Elektronik GmbH / Keil Software, Inc. 1995 - 2006

Tool Version Numbers:
Toolchain Path: BIN30\
C Compiler: ARMCC.Exe
Assembler: ARMASM.Exe
Linker/Locator: ARMLINK.Exe
Librarian: ARMAR.Exe
Hex Converter: FROMELF.Exe
CPU DLL: SARM.DLL V1.51
Dialog DLL: DARMP.DLL V1.11e
Target DLL: BIN\UL2ARM.DLL V1.17
Dialog DLL: TARMP.DLL V1.10