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R5F563TBAGFB Datasheet(PDF) 49 Page - Renesas Technology Corp |
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R5F563TBAGFB Datasheet(HTML) 49 Page - Renesas Technology Corp |
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49 / 186 page  R01DS0087EJ0220 Rev.2.20 Page 49 of 186 Mar 31, 2016 RX63T 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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