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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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M38B53M4-059FP 데이터시트(PDF) 270 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP 데이터시트(HTML) 270 Page - Mitsubishi Electric Semiconductor |
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270 / 355 page  3-22 APPENDIX 38B5 Group User’s Manual 3.3 Notes on use Fig. 3.3.6 Initialization of processor status register How to reference the processor status register To reference the contents of the processor status register (PS), execute the PHP instruction once then read the contents of (S+1). If necessary, execute the PLP instruction to return the PS to its original status. A NOP instruction should be executed after every PLP instruction. 3.3.10 Notes on programming (1) Processor status register Initializing of processor status register Flags which affect program execution must be initialized after a reset. In particular, it is essential to initialize the T and D flags because they have an important effect on calculations. q Reason After a reset, the contents of the processor status register (PS) are undefined except for the I flag which is “1”. Fig. 3.3.8 Stack memory contents after PHP instruction execution Fig. 3.3.7 Sequence of PLP instruction execution Reset ↓ Initializing of flags ↓ Main program PLP instruction execution ↓ NOP (S) (S)+1 Stored PS |
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