ZiLOG Z8 PLUS User Manual page 133

INTERRUPT SOURCES
Table 4-1 presents the interrupt types, sources, and vectors available in the Z8E001. Other processors from
P
LUS
the Z8 family may define the interrupts differently.
Table 4-1. Z8E001 Interrupt Types, Sources, and Vectors
Name Sources
IREQ Timer0 Time-out
0
IREQ PB4 High-to-Low
1
Transition
IREQ Timer1 Time-out
2
IREQ PB2 High-to-Low
3
Transition
IREQ PB4 Low-to-High
4
Transition
IREQ Timer2 Time-out
5
IREQ - Reserved
6
IREQ
15
External Interrupt Sources
External sources can be generated by a transition on the corresponding Port pin. The interrupt may detect a
rising edge, a falling edge, or both.
NOTES:
1. 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.
2. Although interrupts are edge triggered, minimum interrupt request Low and High times must be
observed for proper operation. See the device product specification for exact timing requirements on
external interrupt requests (T
Vector
Location
2,3 Internal
4,5 External (PB4), Edge Triggered
6,7 Internal
8,9 External (PB2), Edge Triggered
A,B External (PB4), Edge Triggered
C,D Internal
Reserved for future expansion
IL, T IH).
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Comments
Fixed
Priority
1 (Highest)
2
3
4
5
6 (Lowest)