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RX634 数据表(PDF) 20 Page - Renesas Technology Corp |
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RX634 数据表(HTML) 20 Page - Renesas Technology Corp |
20 / 106 page R01DS0255EJ0100 Rev.1.00 Page 20 of 106 Feb 25, 2015 RX634 Group 2. CPU 2.3 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. |
类似零件编号 - RX634 |
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类似说明 - RX634 |
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