SH7713 datasheet(170/904 Pages) RENESAS

tên linh kiện	SH7713

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Section 3 DSP Operating Unit

Rev.1.50 Aug. 30, 2006 Page 130 of 860

REJ09B0288-0150

The DC bit is set when the operation result is a negative value, and cleared when the operation

result is zero or a positive value.

3. Zero Value Mode: CS[2:0] = 010

The DC bit is set when the operation result is zero; otherwise it is cleared.

4. Overflow Mode: CS[2:0] = 011

The DC bit is set when an overflow occurs.

5. Signed Greater Than Mode: CS[2:0] = 100

The DC bit is always cleared.

6. Signed Greater Than or Equal Mode: CS[2:0] = 101

The DC bit is always cleared.

The N bit always indicates the same state as the DC bit set in negative value mode by the CS[2:0]

bits. See the negative value mode part above. The Z bit always indicates the same state as the DC

bit set in zero value mode by the CS[2:0] bits. See the zero value mode part above. The V bit

always indicates the same state as the DC bit set in overflow mode by the CS[2:0] bits. See the

overflow mode part above. The GT bit always indicates the same state as the DC bit set in signed

greater than mode by the CS[2:0] bits. See the signed greater than mode part above.

• Overflow Protection

The S bit in SR is also effective for arithmetic shift operation in the DSP unit. See section

3.5.11, Overflow Protection, for details.

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