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UPD17708 Datasheet(PDF) 136 Page - Renesas Technology Corp |
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UPD17708 Datasheet(HTML) 136 Page - Renesas Technology Corp |
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136 / 358 page  µPD17704, 17705, 17707, 17708, 17709 134 12.3.2 Interrupt stack pointer of system register The interrupt stack pointer of the system register detects the nesting level of interrupts. The interrupt stack pointer can be only read and cannot be written. The configuration and function of the interrupt stack pointer are illustrated below. Name Flag symbol b3 0 b2 S Y S R S P 2 b1 S Y S R S P 1 b0 S Y S R S P 0 Address 08H Read/Write R Interrupt stack pointer of system registers 01 1 1 0 0 0 1 1 1 Use prohibited 4 levels (INTSK1) 3 levels (INTSK2) 2 levels (INTSK3) 1 level (INTSK4) 0 level Detects level of interrupt stack of system registers Fixed to “0” 0 1 0 1 0 1 0 0 1 1 0 0 0 0 0 0 1 1 Power-ON reset WDT&SP reset CE reset Retained Clock stop |
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