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SH7713 데이터시트(PDF) 141 Page - Renesas Technology Corp |
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SH7713 데이터시트(HTML) 141 Page - Renesas Technology Corp |
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141 / 904 page ![]() 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 register. If the DMY bit of the SR register is set, the modulo addressing is specified for the Y 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 1 STC.L MOD, @ −Rn Rn – 4 → Rn, MOD → (Rn) 1 LDC @Rn+, MOD (Rn) → MOD, Rn + 4 → Rn 4 LDC Rn, MOD Rn → MOD 4 |
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