SH7721 datasheet(171/1524 Pages) RENESAS

171 / 1524 page

Section 3 DSP Operating Unit

Rev. 3.00 Jan. 18, 2008 Page 109 of 1458

REJ09B0033-0300

An example of the use of modulo addressing is shown below.

MOV.L #H’70047000, R10

;Specify MS=H’7000 ME = H’7004

LDC R10,MOD

;Specify ME:MS to MOD register

STC SR, R10

;

MOV.L #H’FFFFF3FF, R11;

MOV.L #H’00000400, R12;

AND R11, R10

;

OR R12, R10

;

LDC R10, SR

; Specify SR.MDX=1,

SR.MDY=0, and X modulo addressing mode

MOV.L #H’A5007000, R4

MOVX.W @R4+,X0

; R4: H’A5007000

→ H’A5007002

MOVX.W @R4+,X0

; R4: H’A5007002

→ H’A5007004

MOVX.W @R4+,X0

; R4: H’A5007004

→ H’A5007000

(Matches to ME and MS is set)

MOVX.W @R4+,X0

; R4: H’A5007000

→ H’A5007002

The start and end addresses are specified in MS and ME, then the DMX or DMY bit is set to 1.

When the X or Y data transfer instruction specified by the DMX or DMY is executed, the address

stored in the address register as the value after updating.

When the addressing type of the X/Y data transfer instruction is no-update, the X/Y data transfer

instruction is not returned to MS even if they match ME. When the addressing type of the X/Y

data transfer instruction is addition index register addressing, the address pointed may not match

the address pointer ME, and exceed it. In this case, the address pointer value does not become the

modulo start address.

The maximum modulo size is 64 kbytes. This is sufficient to access the X and Y data memory.

Note:

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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