Lpc2000

All,

I have  a process receiving data from an rf modem (currently running at
4800 baud) using EXTINT2.  The data is clocked into a byte and complete
bytes are placed into a temporary holding buffer.  The main thread
periodically pulls the data from the holding buffer into a larger buffer
in order to perform operations on it (bit shifts, etc.).  I've been
receiving data abort exceptions periodically on this process.  Turns out
that I was disabling EXTINT2 prior to pulling data from the temp buffer
and reenabling EXTINT2 immediately afterwards.  This disabling/enabling
is what is causing the exception, i.e. if I remove the disable/reenable
the problem goes away as far as I can tell.  I am disabling by writing
0x10000 to VICIntEnClr (0xfffff014), enabling by writing 0x10000 to
VICIntEnable (0xfffff010).  

Two questions:

1.  Is this the correct approach for disabling/reenabling EXTINT2?
2.  Can anyone venture a guess why disabling/enabling EXTINT2 would
cause a data abort?

TIA to all responders...

Curt