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R5F5630ECDFB Datasheet(PDF) 71 Page - Renesas Technology Corp |
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R5F5630ECDFB Datasheet(HTML) 71 Page - Renesas Technology Corp |
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71 / 165 page  R01DS0060EJ0100 Rev.1.00 Page 71 of 168 Sep 13, 2011 RX630 Group 2. CPU 2.2.1 Register Associated with DSP Instructions (1) Accumulator (ACC) The accumulator (ACC) is a 64-bit register used for DSP instructions. The accumulator is also used for the multiply and multiply-and-accumulate instructions; EMUL, EMULU, FMUL, MUL, and RMPA, in which case the prior value in the accumulator is modified by execution of the instruction. Use the MVTACHI and MVTACLO instructions for writing to the accumulator. The MVTACHI and MVTACLO instructions write data to the higher-order 32 bits (bits 63 to 32) and the lower-order 32 bits (bits 31 to 0), respectively. Use the MVFACHI and MVFACMI instructions for reading data from the accumulator. The MVFACHI and MVFACMI instructions read data from the higher-order 32 bits (bits 63 to 32) and the middle 32 bits (bits 47 to 16), respectively. |
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