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HD6432351 bảng dữ liệu(PDF) 68 Page - Renesas Technology Corp |
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HD6432351 bảng dữ liệu(HTML) 68 Page - Renesas Technology Corp |
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68 / 1025 page ![]() Section 2 CPU Rev. 3.00 Sep 15, 2006 page 34 of 988 REJ09B0330-0300 The carry flag is also used as a bit accumulator by bit manipulation instructions. 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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