Specifications
Theory of Operation
7. This step applies only to systems with the STD bus CPU
configured for edge triggered as opposed to level triggered
interrupts. To avoid missing an interrupt request, the interrupt
service routine must continue servicing the shared interrupt
sources until the STD bus status bit of the ZT 8832 Interrupt
Status Port is inactive. This prevents the possibility of missing a
request because the edge occurred while servicing another
request. If there is more than one ZT 8832 sharing an interrupt
request, the STD bus status bit is redundant.
3-20