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5.4.3
Interrupt Response Time
Table 5.5 indicates the interrupt response time from the occurrence of an interrupt request until the
first instruction of the interrupt service routine is executed.
Table 5.5
Interrupt Response Time
External Memory
On-Chip
8-Bit Bus
16-Bit Bus
No.
Item
Memory
2 States
3 States
2 States
3 States
1
Interrupt priority
decision
2*
1
2*
1
2*
1
2*
1
2*
1
2
Maximum number
of states until end of
current instruction
1 to 23
1 to 27
1 to 31*
4
1 to 23
1 to 25*
4
3
Saving PC and CCR
to stack
4
8
12*
4
4
6*
4
4
Vector fetch
4
8
12*
4
4
6*
4
5
Instruction fetch*
2
4
8
12*
4
4
6*
4
6
Internal processing*
3
4
4
4
4
4
Total
19 to 41
31 to 57
43 to 73
19 to 41
25 to 49
Notes: 1. 1 state for internal interrupts.
2. Prefetch after the interrupt is accepted and prefetch of the first instruction in the
interrupt service routine.
3. Internal processing after the interrupt is accepted and internal processing after vector
fetch.
4. The number of states increases if wait states are inserted in external memory access.
Summary of Contents for H8/3008
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