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RX634 数据表(PDF) 20 Page - Renesas Technology Corp

部件名 RX634
功能描述  54 MHz 32-bit RX MCU with FPU, 90 DMIPS, up to 2-Mbyte flash memory
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

RX634 数据表(HTML) 20 Page - Renesas Technology Corp

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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.


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