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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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COP8SCR9KMT7 데이터시트(PDF) 55 Page - National Semiconductor (TI) |
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COP8SCR9KMT7 데이터시트(HTML) 55 Page - National Semiconductor (TI) |
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55 / 80 page  15.0 Interrupts (Continued) STPND flag will have the wrong state. This will allow maskable interrupts to be acknowledged during the servicing of the first Software Trap. To avoid problems such as this, the user program should contain the Software Trap routine to perform a recovery procedure rather than a return to normal execution. Under normal conditions, the STPND flag is reset by a RPND instruction in the Software Trap service routine. If a programming error or hardware condition (brownout, power supply glitch, etc.) sets the STPND flag without providing a way for it to be cleared, all other interrupts will be locked out. To alleviate this condition, the user can use extra RPND instructions in the main program and in the Watchdog ser- vice routine (if present). There is no harm in executing extra RPND instructions in these parts of the program. 10138934 FIGURE 28. VIS Flow Chart www.national.com 55 |
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