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UPD17708 Datasheet(PDF) 138 Page - Renesas Technology Corp

Part # UPD17708
Description  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Datasheet(HTML) 138 Page - Renesas Technology Corp

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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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