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5.4.2
Interrupt Exception Handling Sequence
Figure 5.7 shows the interrupt exception handling sequence in mode 2 when the program code and
stack are in an external memory area accessed in two states via a 16-bit bus.
φ
Address
bus
Interrupt
request
signal
RD
HWR
D to D
15
8
(1)
(2), (4)
(3)
(5)
(7)
Note: Mode 2, with program code and stack in external memory area accessed in two states via 16-bit bus.
LWR
,
Interrupt level
decision and wait
for end of instruction
Interrupt accepted
Instruction
prefetch
Internal
processing
Stack
V
ector fetch
Internal
processing
Prefetch of
interrupt
service routine
instruction
High
Instruction prefetch address (not executed;
return address, same as PC contents)
Instruction code (not executed)
Instruction prefetch address (not executed)
SP
–
2
SP
–
4
(6), (8)
(9), (1
1)
(10), (12)
(13)
(14)
PC and CCR saved to stack
V
ector address
Starting address of interrupt service routine (contents of
vector address)
Starting address of interrupt service routine; (13) = (10), (12)
First instruction of interrupt service routine
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(1
1)
(12)
(13)
(14)
Figure 5.7 Interrupt Exception Handling Sequence
Summary of Contents for H8/3008
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