SH7616 datasheet(86/935 Pages) RENESAS

86 / 935 page

Section 2 CPU

Rev. 2.00 Mar 09, 2006 page 60 of 906

REJ09B0292-0200

Instruction (MOVX/MOVY)

DMX

CONT

CMP

ALU

ABx

ABy

R4[Ax]

R6[Ay]

R5[Ax]

R7[Ay]

R8[Ix]

R9[Iy]

DMY

XAB

YAB

Figure 2.11 Modulo Addressing

An example of modulo addressing is indicated below:

MS=H'E008; ME=H'E00C; R4=H'1000E008;

DMX=1; DMY=0;

(sets modulo addressing for address register Ax (R4, R5))

The R4 register changes as follows due to the above settings.

R4: H'1000E008

Inc.

R4: H'1000E00A

Inc.

R4: H'1000E00C

Inc.

R4: H'1000E008

(becomes the modulo start address because the modulo end

address occurred)

Data is placed so that the upper 16 bits of the modulo start and end addresses become identical.

This is so because the modulo start address replaces only the lower 15 bits of the address register,

excepting bit 0.

Note: When using add index with DSP data addressing, there are cases where the value is

exceeded without the address pointer matching the ME. In such cases, the address pointer

does not return to the modulo start address. Bit 0 is disregarded not only for modulo

addressing, but also during X, Y data addressing, so always write 0 to the 0 bits of the

address pointer, index register, MS, and ME.

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