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UPD17708 データシート(PDF) 136 Page - NEC |
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UPD17708 データシート(HTML) 136 Page - NEC |
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136 / 356 page  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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