R5F5631ADDFB datasheet(50/108 Pages) RENESAS

Il numero della parte	R5F5631ADDFB

Spiegazioni elettronici	Renesas MCUs

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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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