Cannot read IPENDING register!

Hi guys,

I'm new to this niosII concept. I've only started working with it a week ago for my final year project.

every code i wrote worked fine except when interrupts are required (i'm using internal interrupt controller)

after debugging like 5 programs, i always find the same problem: I JUST CANNOT READ IPENDING REGISTER!!:confused:.

to make sure, i wrote the following program:

.text

again: rdctl r23,ipending

br again

and i passed it to the monitor program, i've changed the ipending register's value randomly. NONE of the values wheye loaded to r23!

is this a common problem? does anyone knows what to do???

i expect a fast respond as like i said i'm working on my final year project and every day counts

thx in advance ;)