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HCS12 Datasheet(PDF) 403 Page - Freescale Semiconductor, Inc |
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HCS12 Datasheet(HTML) 403 Page - Freescale Semiconductor, Inc |
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403 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 Freescale Semiconductor 403 B.1 Introduction This appendix discusses similarities and differences between the CPU12 and the M68HC11 CPU. In general, the CPU12 is a proper superset of the M68HC11. Significant changes have been made to improve the efficiency and capabilities of the CPU12 without eliminating compatibility and familiarity for the large community of M68HC11 programmers. B.2 CPU12 Design Goals The primary goals of the CPU12 design were: • Absolute source code compatibility with the M68HC11 • Same programming model • Same stacking operations • Upgrade to 16-bit architecture • Eliminate extra byte/extra cycle penalty for using index register Y • Improve performance • Improve compatibility with high-level languages Reference Manual — S12CPUV2 Appendix B. M68HC11 to CPU12 Upgrade Path |
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