SH7721 datasheet(188/1524 Pages) RENESAS

188 / 1524 page

Section 3 DSP Operating Unit

Rev. 3.00 Jan. 18, 2008 Page 126 of 1458

REJ09B0033-0300

Table 3.21

Variation of ALU Fixed-Point Operations

Mnemonic

Function

Source 1

Source 2

Destination

PADD

Addition

Dz (Du)

PSUB

Subtraction

Dz (Du)

PADDC

Addition with carry

PSUBC

Subtraction with borrow

PCMP

Comparison



All 0

PCOPY

Data copy

All 0

PABS

Absolute

All 0

PNEG

Negation

All 0

PCLR

Clear

All 0

Table 3.22

Correspondence between Operands and Registers

Yes

As shown in figure 3.10, data loaded from the memory at the MA stage, which is programmed at

the same line as the ALU operation, is not used as a source operand for this operation, even

though the destination operand of the data load operation is identical to the source operand of the

ALU operation. In this case, previous operation results are used as the source operands for the

ALU operation, and then updated as the destination operand of the data load operation.

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