SH7616 datasheet(82/935 Pages) RENESAS

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Section 2 CPU

Rev. 2.00 Mar 09, 2006 page 56 of 906

REJ09B0292-0200

2.4.2

DSP Data Addressing

There are two different kinds of memory accesses with DSP instructions. One type is with the X,

Y data transfer instructions (MOVX.W, MOVY.W), and the other is with the single data transfer

instructions (MOVS.W, MOVS.L). The data addressing differs between these two types of

instructions. Table 2.13 shows a summary of the data transfer instructions.

Table 2.13 Overview of Data Transfer Instructions

Classification

X, Y Data Transfer Processing

(MOVX.W, MOVY.W)

Single Data Transfer Processing

(MOVS.W, MOVS.L)

Address registers

Ax: R4, R5; Ay: R6, R7

As: R2, R3, R4, R5

Index registers

Ix: R8, Iy: R9

Is: R8

Addressing

Nop/Inc(+2)/index addition: post-

update

Nop/Inc(+2,+4)/index addition: post-

update

—

Dec(–2,–4): pre-update

Modulo addressing

Possible

Not possible

Data bus

XDB, YDB

CDB

Data length

16 bit (word)

16 bit/32 bit (word/longword)

Bus contention

None

Yes

Memory

X, Y data memory

All memory spaces

Source registers

Dx, Dy: A0, A1

Ds: A0/A1, M0/M1, X0/X1, Y0/Y1,

A0G, A1G

Destination registers

Dx: X0/X1; Dy: Y0/Y1

Ds: A0/A1, M0/M1, X0/X1, Y0/Y1,

A0G, A1G

X, Y Data Addressing: Among the DSP instructions, the MOVX.W and MOVY.W instructions

can be used to simultaneously access X, Y data memory. The DSP instructions have two address

pointers for simultaneous accessing of X, Y data memory. Only pointer addressing is possible with

DSP instructions; there is no immediate addressing. The address registers are divided into two; the

R4, R5 registers become the X memory address register (Ax), and the R6, R7 registers become the

Y memory address register (Ay). The following three types of addressing exist with X, Y data

transfer instructions.

1. Non-updated address registers: The Ax, Ay registers are address pointers. They are not

updated.

2. Add index registers: The Ax, Ay registers are address pointers. The Ix, Iy register values are

added to them, respectively, after the data transfer (post-update).

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