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UPD17228CT Datasheet(PDF) 45 Page - NEC |
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UPD17228CT Datasheet(HTML) 45 Page - NEC |
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45 / 84 page  µPD17225, 17226, 17227, 17228 45 Data Sheet U12643EJ2V0DS00 7.3.2 Returning from interrupt processing routine To return from an interrupt processing routine, use the RETI instruction. Then the following processing is executed within an instruction cycle. Loads contents of interrupt stack register to PSWORD Increments value of stack pointer by 1 Loads contents of stack addressed by stack pointer to program counter To enable an interrupt after the processing of an interrupt has been finished, the EI instruction must be executed immediately before the RETI instruction. Accepting the interrupt is enabled by the EI instruction after the instruction next to the EI instruction has been executed. Therefore, the interrupt is not accepted between the EI and RETI instructions. |
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