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How to debug an isr?

Hi!

I have written a simple uart driver for the nordic bRF24E1 (8051 with intergrated rf) and somehow i do not seem to be able to debug my interrupt service routine.

EA is set to 1 and Serial Interrupt is enabled but when i set a breakpoint inside the isr the debugger will not stop at the breakpoint.

The isr is triggered however. I know it because there seems to be a bug in my isr (stack is messed up) which only occurs when EA = 1. As soon as i disable interrupts the bug goes away. So isr is triggered but i can not debug it because tracing into the isr doesn't seem to be possible.

So how can i debug interupt-service-routines with the integrated debugger?

Regards

Christian

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