R5F572TFGDFP datasheet(51/176 Pages) RENESAS

Il numero della parte	R5F572TFGDFP

Spiegazioni elettronici	Maximum operating frequency: 200 MHz Capable of 1160 CoreMark in operation at 200 MHz

PDF	176 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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51 / 176 page

R01DS0331EJ0100 Rev.1.00

Page 51 of 176

Feb 08, 2019

RX72T Group

2. CPU

2.3

Accumulator

The accumulator (ACC0 or ACC1) is a 72-bit register used for DSP instructions. The accumulator is handled as a 96-bit

register for reading and writing. At this time, when bits 95 to 72 of the accumulator are read, the value where the value of

bit 71 is sign extended is read. Writing to bits 95 to 72 of the accumulator is ignored. ACC0 is also used for the multiply

and multiply-and-accumulate instructions; EMUL, EMULU, FMUL, MUL, and RMPA, in which case the prior value in

ACC0 is modified by execution of the instruction.

Use the MVTACGU, MVTACHI, and MVTACLO instructions for writing to the accumulator. The MVTACGU,

MVTACHI, and MVTACLO instructions write data to bits 95 to 64, the higher-order 32 bits (bits 63 to 32), and the

lower-order 32 bits (bits 31 to 0), respectively.

Use the MVFACGU, MVFACHI, MVFACMI, and MVFACLO instructions for reading data from the accumulator. The

MVFACGU, MVFACHI, MVFACMI, and MVFACLO instructions read data from the guard bits (bits 95 to 64), higher-

order 32 bits (bits 63 to 32), the middle 32 bits (bits 47 to 16), and the lower-order 32 bits (bits 31 to 0), respectively.

R5F572TFGDFP Scheda tecnica(PDF) 51 Page - Renesas Technology Corp