Intel 8XC196MC User Manual page 95

8XC196MC, MD, MH USER'S MANUAL
The interrupt service routine should read the PI_PEND (Figure 5-12 on page 5-23) register to de-
termine the source of the interrupt. Before executing the return instruction, the interrupt service
routine should check to see if any of the other interrupt sources are pending. Generally, PTS in-
terrupt service is not useful for multiplexed interrupts because the PTS cannot readily determine
the interrupt source.
Figure 5-3. Flow Diagram for the OVRTM Interrupt
5-8
Timer x
Overflows
Set OVRTM x
bit in PI_PEND
Is OVRTM x
bit set in
PI_MASK
?
Yes
Set OVRTM
bit in INT_PEND
Is OVRTM
bit set in
INT_MASK
?
Yes
Generate
OVRTM interrupt
Read PI_PEND
to see which
timer overflowed
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OVRTM bit
No
is not set
in INT_PEND
No
OVRTM interrupt
is not generated
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