Zilog Z16C30 - Manual (Page 132)

7-4
Z16C30 USC ®
U SER ' S M ANUAL
UM97USC0100
Z ILOG
7.5 INTERRUPT TYPES AND SOURCES
Internally, the USC uses a daisy-chaining scheme much
like that described earlier. Each channel includes six
interrupt “types”, that are arranged in a fixed priority order.
Four of the six types include several independent interrupt
stimuli or “sources”. Figure 7-3 shows all of the interrupt types and sources in
one channel of a USC, arranged with the highest priority
type at the top. The relative priority of the two channels is
determined by external wiring among the IEI and IEO pins,
or by a external interrupt controller.
UM009402-0201