SH7713 datasheet(141/904 Pages) RENESAS

tên linh kiện	SH7713

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Section 3 DSP Operating Unit

Rev.1.50 Aug. 30, 2006 Page 101 of 860

REJ09B0288-0150

address (ME), respectively. The LDC and STC instructions are extended for MOD register

handling.

If the DMX bit of the SR register is set, the modulo addressing is specified for the X address

address register. Modulo addressing is valid for either the X or the Y address register, only; it

cannot be set for both at the same time. Therefore, DMX and DMY cannot both be set

simultaneously (if they are, the DMY setting will be valid). ( In the future, this specification may

be changed.) The DMX and DMY bits of the SR can be specified by the STC or LDC instruction

for the SR register.

If an exception is accepted during modulo addressing, the DMX and DMY bits of the SR and

MOD register must be saved. By restoring these register values, a control is returned to the

modulo addressing after an exception handling.

Table 3.11

Modulo Addressing Control Instructions

Instruction

Operation

Execution States

STC MOD, Rn

MOD

→ Rn

STC.L

MOD, @

−Rn

Rn – 4

→ Rn, MOD → (Rn)

LDC @Rn+, MOD

(Rn)

→ MOD, Rn + 4 → Rn

LDC Rn, MOD

→ MOD

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