external device strecth

We designed a TINI board, and added an external UART to it. To be able to use it, we had
to change CKCON to enlarge the memory access cycles (under ~CE3), but doing this the
overall system performance was degraded.
An ISR was chained to be able to treat other connected devices interrupts into TINI (a
communications co-processor).

Is it possible to change the external UART stretch cycles only, not the global CKCON ?
If not possible, in my understanding it could be done inserting an ISR to be run before
the external UART ISR, responsible for identifying the external UART interrupt request,
changing CKCON, executing external UART ISR, and restoring the normal CKCON ! Can it be
done ? Has anybody tried this before ? How ?

Thank you in advance,

                Eduardo Freire
                CSI Engenharia e Sistemas

Visite nosso site www.csi.ind.br


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