Z86L79 Datasheet, PDF (38/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Z86L79/80
Low-Voltage Microcontroller
FUNCTIONAL DESCRIPTION (Continued)
Interrupts. The Z86L7X has five different interrupts. The
interrupts are maskable and prioritized (Figure 31). The
five sources are divided as follows: three sources are
claimed by Port 3 lines P33-P31, the remaining two by the
Zilog
counter/timers (Table 3). The Interrupt Mask Register glo-
bally or individually enables or disables the five interrupt
requests.
IRQ0 IRQ2
IRQ 1, 3, 4
Interrupt
Edge
Select
IRQ Register (D6, D7)
IRQ
IMR
5
Interrupt
Request
Global
Interrupt
Enable
IPR
Priority
Logic
Vector Select
Figure 31. Interrupt Block Diagram
3-38
PRELIMINARY
DS97LVO0601