hello experts,

I am new to 8051 and I have a quick question on interrupts that is not covered in the manual / data sheet (as far as I read it).

When an interrupt signal (ex1) is received, I want to disable further events from ex1 completely until the ISR is finished. In other words, if another event was received on that port during its ISR, I want to ignore it.

I tried to do this by disabling it by simple:

CLR EX1

But this doesnt really do. It runs the ISR again as soon as the first ISR is finished. I tried clearing the flag, IE1, on the exit of the ISR to see if this would work, but this again did not work.

I am not sure if this the simulator's fault or mine. Any advice / comment will be much appreciated.

Cheers,
Yusuke