Zilog Z16C30 Manuale Utente Scaricare il pdf (Pagina 132)

7-4

Z16C30 USC

USER'S MANUAL

UM97USC0100

ZILOG

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

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Zilog Z16C30 Manuale Utente Pagina 132