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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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UPD17708 Datenblatt(PDF) 297 Page - NEC |
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UPD17708 Datenblatt(HTML) 297 Page - NEC |
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297 / 356 page  297 µPD17704, 17705, 17707, 17708, 17709 Caution To reset the interrupt request flag (IRQxxx) once before the halt instruction is executed, insert a NOP instruction (or one or more other instructions) between the HALT instruction and the instruction that resets the interrupt request flag (IRQxxx) as shown below. If a NOP instruction (or one or more other instructions) is not inserted, the interrupt request flag is not reset, and therefore, the halt status is released immediately. Example : : ; IRQxxx is set at certain timing : CLR1 IRQ ××× ; Resets IRQxxx flag once NOP ; Resets IRQxxx flag at this timing ; Unless this period is missing, the IRQxxx flag is not reset, ; and the next HALT instruction is immediately released HALT 1000B ; |
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