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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HCS12 数据表(PDF) 138 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 138 Page - Freescale Semiconductor, Inc |
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138 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 138 Freescale Semiconductor Operation: (PC) + $0002 ⇒ PC Description: Never branches. BRN is effectively a 2-byte NOP that requires one cycle to execute. BRN is included in the instruction set to provide a complement to the BRA instruction. The instruction is useful during program debug, to negate the effect of another branch instruction without disturbing the offset byte. A complement for BRA is also useful in compiler implementations. Execution time is longer when a conditional branch is taken than when it is not, because the instruction queue must be refilled before execution resumes at the new address. Since the BRN branch condition is never satisfied, the branch is never taken, and only a single program fetch is needed to update the instruction queue. See 3.8 Relative Addressing Mode for details of branch execution. BRN Branch Never BRN CCR Details: S X HIN Z V C –––––––– Source Form Address Mode Object Code Access Detail HCS12 M68HC12 BRN rel8 REL 21 rr P P |
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