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Fig. 11-7 Interrupt Stack Operation at Multiple Interrupts
(a) Multiple level-2 interrupts
Undefined
Interrupt
stack
Undefined
Main routine
Interrupt
stack
(b) Multiple level-3 interrupts
Undefined
Undefined
Main routine
MAIN
A
A
If control is returned to the main routine at this time,
BANK and IXE of interrupt A are restored and the
main routine operates abnormally.
MAIN
Undefined
Interrupt A
MAIN
MAIN
MAIN
MAIN
MAIN
MAIN
Undefined
Interrupt A
A
RETI
A
A
A
MAIN
Interrupt B
A
B
RETI
RETI
A
MAIN
A
MAIN
Interrupt B
B
RETI
A
A
PD17062
B
A
Interrupt C
C
RETI
B
A
127
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