SEVERE Bug in mc68360 _ISR_Handler???

Joel Sherrill joel.sherrill at
Tue Jul 17 12:27:00 UTC 2001

Chris Johns wrote:
> Thomas Doerfler wrote:
> >
> > So here we are. I hope I could make my ideas clear in this mail. Any
> > hints welcome....
> >
> Interesting analysis. I am still looking over it.
> FYI I tested this code by looping the RTS/CTS signal on a 68360 serial
> port. The interrupt was on level 4. The CTS interrupt toggled the RTS
> output. Checking the code, it looks like the PIT was at level 1. Hmmm I
> wonder if the timer ever got a look in. I suspect it did not.
> Also, Motorola fixed the '060 and Coldfire's by allowing the first
> instruction after the interrupt to execute before allowing the core to
> service another interrupt.

Then we are back to my question.  Does the hardware give
us anything to check to know we have nested?  The separate
stack m68k's have a throwaway F/VO and we use it.  How about
the 360?

> --
>  Chris Johns, cjohns @

Joel Sherrill, Ph.D.             Director of Research & Development
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