SH7616 datasheet(87/935 Pages) RENESAS

87 / 935 page

Section 2 CPU

Rev. 2.00 Mar 09, 2006 page 61 of 906

REJ09B0292-0200

DSP Addressing Operation: The DSP addressing operation in the item stage (EX) of the

pipeline, including modulo addressing, is indicated below.

if ( Operation is MOVX.W MOVY.W ) {

ABx=Ax; ABy=Ay;

/* memory access cycle uses ABx and ABy. The addresses to be used

have not been updated */

/* Ax is one of R4,5 */

if ( DMX==0 || DMX==1 && DMY==1 )} Ax=Ax+(+2 or R8[Ix} or +0);

/* Inc,Index,Not-Update */

else if (!not-update) Ax=modulo( Ax, (+2 or R8[Ix]) );

/* Ay is one of R6,7 */

if ( DMY==0 ) Ay=Ay+(+2 or R9[Iy] or +0; /* Inc,Index,Not-Update */

else if (! not-update) Ay=modulo( Ay, (+2 or R9[Iy]) );

}

else if ( Operation is MOVS.W or MOVS.L ) {

if ( Addressing is Nop, Inc, Add-index-reg ) {

MAB=As;

/* memory access cycle uses MAB. The address to be used has not

been updated */

/* As is one of R2–5 */

As=As+(+2 or +4 or R8[Is] or +0); /* Inc.Index,Not-Update */

else { /* Decrement, Pre-update */

/* As is one of R2–5 */

As=As+(–2 or –4);

MAB=As;

/* memory access cycle uses MAB. The address to be used has been

updated */

}

/* The value to be added to the address register depends on addressing

operations.

For example, (+2 or R8[Ix] or +0) means that

+2:

if operation is increment

R8[Ix}:

if operation is add-index-reg

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