
Z8 Microcontrollers
Interrupts
ZiLOG
7-2
UM001600-Z8X0599
7.2 INTERRUPT SOURCES
Table 7-1 presents the interrupt types, sources, and vectors available in the Z8 family of processors.
7.2.1 External Interrupt Sources
External sources involve interrupt request lines IRQ0-
IRQ3. IRQ0, IRQ1, and IRQ2 can be generated by a tran-
sition on the corresponding Port 3 pin (P32, P33, and P31
correspond to IRQ0, IRQ1, and IRQ2, respectively).
Figure 7-3 is a block diagram for interrupt sources IRQ0,
IRQ1, and IRQ2.
Note:
The interrupt sources and trigger conditions are
device dependent. See the device product specification to
determine available sources (internal and external),
triggering edge options, and exact programming details.
Table 7-1. Interrupt Types, Sources, and Vectors *
Name
IRQ
0
IRQ
1
IRQ
2
Sources
DAV
0
, IRQ
0
, Comparator
DAV
1
, IRQ
1
DAV
2
, IRQ
2
, TIN, Comparator
IRQ
3
Vector Location
0,1
2,3
4,5
6,7
Comments
External (P3
2
), Edge Triggered; Internal
External (P3
3
), Edge Triggered; Internal
External (P3
1
), Edge Triggered; Internal
External (P3
0
) or (P3
2
), Edge Triggered;
Internal
Internal
Internal
Internal
Internal
Serial In
T
0
Serial Out
T
1
6,7
8,9
8,9
10,11
IRQ
5
Figure 7-3. Interrupt Sources IRQ0-IRQ2 Block Diagram
P3
n
IRQ
m = 0,1,2
System Clock
(Internal)
Multiple Input
and Signal
Conditioning
Circuitry
n = 2, 3, 1
Q
S
R
Q
D
Q
D