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R5F5631ADDFB Fiches technique(PDF) 50 Page - Renesas Technology Corp |
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R5F5631ADDFB Fiches technique(HTML) 50 Page - Renesas Technology Corp |
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50 / 108 page ![]() R01DS0098EJ0090 Rev.0.90 Page 50 of 106 Dec 27, 2011 RX63N Group, RX631 Group 2. CPU Under development Preliminary document Specifications in this document are tentative and subject to change. (9) 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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