NEC PD17062 - page 127

127
µ PD17062
Fig. 11-7 Interrupt Stack Operation at Multiple Interrupts
(a) Multiple level-2 interrupts
(b) Multiple level-3 interrupts
MAIN A
MAIN
BAMAIN
RETIRETI
A
MAIN
MAIN
MAIN
MAIN
MAIN
Interrupt B
Interrupt
stack Undefined
Main routine Interrupt A
Interrupt
stack
Undefined
Undefined
MAIN A
MAIN
B
A
CBAMAIN
BAAA
RETIRETIRETI
AAAA
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.
Undefined
Undefined
Main routine Interrupt A Interrupt B Interrupt C
Undefined