SH7727 datasheet(124/1109 Pages) RENESAS

124 / 1109 page

Section 2 CPU

Rev. 5.00 Dec 12, 2005 page 52 of 1034

REJ09B0254-0500

ALU

R8[Ix]

R9[Iy]

R6[Ay]

R7[Ay]

R4[Ax]

R5[Ax]

16 15

ABx

XAB

16 15

ABy

YAB

DMX

DMY

CONT

CMP

Instruction (MOVX/MOVY)

Figure 2.14 Modulo Addressing

An example of modulo addressing is given below.

MS = H'7008; ME=H'700C; R4=H'A5007008;

DMX = 1; DMY = 0:

(Modulo addressing setting for address register Ax (R4, R5))

As a result of the above settings, the R4 register changes as follows.

R4: H'A5007008

Inc.

R4: H'A500700A

Inc.

R4: H'A500700C

Inc.

R4: H'A5007008

(Reaches modulo end address, so becomes modulo start address)

Place the data so that the upper 16 bits of the modulo start and end addresses are the same. This is

because the modulo start address overwrites only the lower 15 bits of the address register,

excluding bit 0.

Note: When addition indexing is used for DSP data addressing, the address pointer may exceed

the ME value without actually reaching it. In this case, the address pointer will not return

to the modulo start address. Not only with modulo addressing, but when X and Y data

addressing is used, bit 0 is ignored. 0 must always be written to bit 0 of the address

pointer, index register, MS, and ME.

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