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HCS12 データシート(PDF) 431 Page - Freescale Semiconductor, Inc |
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HCS12 データシート(HTML) 431 Page - Freescale Semiconductor, Inc |
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431 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 Freescale Semiconductor 431 C.10 Instruction Set Orthogonality One helpful aspect of the CPU12 instruction set, orthogonality, is difficult to quantify in terms of direct benefit to an HLL compiler. Orthogonality refers to the regularity of the instruction set. A completely orthogonal instruction set would allow any instruction to operate in any addressing mode, would have identical code sizes and execution times for similar operations on different registers, and would include both signed and unsigned versions of all mathematical instructions. Greater regularity of the instruction set makes it possible to implement compilers more efficiently, because operation is more consistent, and fewer special cases must be handled. |
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