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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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H8S/2225 数据表(PDF) 161 Page - Renesas Technology Corp |
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H8S/2225 数据表(HTML) 161 Page - Renesas Technology Corp |
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161 / 1071 page  Section 2 CPU Rev. 5.00 Aug 08, 2006 page 75 of 982 REJ09B0054-0500 Bit Bit Name Initial Value R/W Description 2 Z undefined R/W Zero Flag Set to 1 to indicate zero data, and cleared to 0 to indicate non-zero data. 1 V undefined R/W Overflow Flag Set to 1 when an arithmetic overflow occurs, and cleared to 0 at other times. 0 C undefined R/W Carry Flag Set to 1 when a carry occurs, and cleared to 0 otherwise. Used by: • Add instructions, to indicate a carry • Subtract instructions, to indicate a borrow • Shift and rotate instructions, to indicate a carry The carry flag is also used as a bit accumulator by bit manipulation instructions. 2.4.5 Initial Values of CPU Registers 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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