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UPD17708 Scheda tecnica(PDF) 136 Page - NEC

Il numero della parte UPD17708
Spiegazioni elettronici  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Produttore elettronici  NEC [NEC]
Homepage  http://www.nec.com/
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UPD17708 Scheda tecnica(HTML) 136 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
136
Figure 12-18. Operation of Interrupt Stack (2/2)
(b) Where interrupt nesting level is 5 or more
Caution
The system is reset when an interrupt of level 5 is accepted.
However, the ISPRES flag, which resets the non-maskable interrupt if the interrupt stack
overflows or underflows, must be set to “1”. This flag is “1” after system reset, and can then
be written only once.
Undefined
Undefined
MAIN
MAIN
Undefined
Undefined
Undefined
A
A
MAIN
Undefined
Undefined
B
Main routine
Interrupt level 1
Interrupt level 2
C
B
A
MAIN
D
D
C
B
A
E
Interrupt D
Interrupt E
Interrupt level 4
Interrupt level 5
System reset
Interrupt A
Interrupt C



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