MC68HC901 Datasheet, PDF (62/73 Pages) Motorola, Inc – Multi-Function Peripheral

Electrical Characteristics
CLK
4
26
IACK
DS
IEI
IEO
D0 - D7
DTACK
14
16
15
(SEE NOTE)
13
18
17
9
6
7
NOTE:
IEO only goes low if no acknowledgeable interrupt is pending. If IEO goes low, DTACK and
the data bus remain in the high-impendance state.
Figure 8-5. Interrupt Acknowledge Cycle (IEI Low)
FIGURE - INTERRUPT ACKNOWLEDGE CYCLE (IEI Low) TIMING
MC68HC901UM / AD
8-9
MC68HC901 USER’S MANUAL
MOTOROLA