HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 188

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 3 DSP Operation
Addressing Instructions in Execution Stage: Address instructions, including modulo addressing,
are executed in the execution stage of the pipeline. Behavior of the DSP data addressing in the
execution stage is shown below.
Rev. 4.00 Sep. 14, 2005 Page 138 of 982
REJ09B0023-0400
/* As is one of R2 to R5 */
As = As+(+2 or +4 or R8[Is] or +0); /* Inc,Index,Not-Update */
/* As is one of R2 to R5 */
As=As+(-2 or -4);
MAB=As;
/* Memory access cycle uses MAB. The address to be used has been
updated. */
}
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 ) {
MAB=As;
/* Memory access cycle uses MAB. The address to be used has not been
updated.*/
else { /* Decrement, Pre-update */
if ( Addressing is Nop, Inc, Add-index-reg ) {