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SH7721 Datasheet(PDF) 193 Page - Renesas Technology Corp |
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SH7721 Datasheet(HTML) 193 Page - Renesas Technology Corp |
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193 / 1524 page ![]() Section 3 DSP Operating Unit Rev. 3.00 Jan. 18, 2008 Page 131 of 1458 REJ09B0033-0300 3.5.5 ALU Integer Operations Figure 3.14 shows the ALU integer arithmetic operation flow. Table 3.23 shows the variation of this type of operation. The correspondence between each operand and registers is the same as ALU fixed-point operations as shown in table 3.22. 31 31 39 Ignored Cleared to 0 31 39 0 Source 1 0 Destination ALU DSR 39 0 Source 2 GT Z N V DC Guard Guard Guard Figure 3.14 ALU Integer Arithmetic Operation Flow Table 3.23 Variation of ALU Integer Operations Mnemonic Function Source 1 Source 2 Destination Sx +1 Dz PINC Increment by 1 +1 Sy Dz Sx –1 Dz PDEC Decrement by 1 –1 Sy Dz Note: The ALU integer operations are basically 24-bit operation, the upper 16 bits of the base precision and 8 bits of the guard-bits parts. So the signed bit is copied to the guard-bit parts when a register not providing the guard-bit parts is specified as the source operand. When a register not providing the guard-bit parts is specified as a destination operand, the upper word excluding the guard bits of the operation result are input into the destination register. |
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