68300

Hello 68300 community,

CPU: 68332

I have no clue what's going on. I use six TPU-Channels as UART (3*Rx,3*Tx).
At some point one of those channels * not always the same * is not able to delete 
his own CISR flag. This leads to an endless interrupt loop -> system crash. 

The CIER and the TICR register looks fine to me; they contain the same
value like before the crash. 

I even can not change the CISR flag with my debugger when the system
is in the endless interrupt loop. The CISR Flag of the hanging channel
seems to be kind of locked.

Note:
I reset the CISR Flag by doing  AND.W  #$FFFE,CISR  (for example)
It works half an hour ok, but at some point it hangs.

Please help me, why can't I clear the CISR Flag?

Ivo


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Ivo Strebel
SCHILLER AG, Altgasse 68, CH-6341 Baar
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