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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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H8S2245 数据表(PDF) 74 Page - Renesas Technology Corp |
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H8S2245 数据表(HTML) 74 Page - Renesas Technology Corp |
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74 / 818 page  Section 2 CPU Rev.3.00 Mar. 26, 2007 Page 32 of 772 REJ09B0355-0300 Some instructions leave some or all of the flag bits unchanged. For the action of each instruction on the flag bits, refer to appendix A.1, Instruction List. Operations can be performed on the CCR bits by the LDC, STC, ANDC, ORC, and XORC instructions. The N, Z, V, and C flags are used as branching conditions for conditional branch (Bcc) instructions. 2.4.4 Initial Register Values Reset exception handling loads the CPU's program counter (PC) from the vector table, clears the trace bit in EXR to 0, and sets the interrupt mask bits in CCR and EXR to 1. The other CCR bits and the general registers are not initialized. In particular, the stack pointer (ER7) is not initialized. The stack pointer should therefore be initialized by an MOV.L instruction executed immediately after a reset. |
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