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UPD78C18 Datasheet(PDF) 64 Page - NEC |
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UPD78C18 Datasheet(HTML) 64 Page - NEC |
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64 / 110 page  64 µPD78C17,78C18 3.4 INTERRUPT OPERATION BY SOFTI INSTRUCTION When the SOFTI instruction is executed, the program jumps unconditionally to the interrupt address (0060H). The SOFTI instruction interrupt is not affected by the IE F/F, and the IE F/F is not affected when this instruction is executed. The servicing procedure for an interrupt generated by the SOFTI instruction is as follows: (i) The PSW, upper PC byte, and lower PC byte are saved to the stack memory in that order. (ii) The program jumps to the interrupt address (0060H). Caution If the skip condition is satisfied by the instruction (arithmetic or logical operation, increment/ decrement, shift, skip, or RETS instruction) immediately before the SOFTI instruction, the SOFTI instruction is executed and not skipped. When SOFTI instruction is executed, the SK flag of the PSW is saved as set (1) to the stack area. Thus, when the return is made from the SOFTI service routine, the PSW SK flag remains set and the instruction following the SOFTI instruction is skipped. |
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