SH7727 datasheet(167/1109 Pages) RENESAS

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Section 2 CPU

Rev. 5.00 Dec 12, 2005 page 95 of 1034

REJ09B0254-0500

Conditional Operations and Data Transfer: Some instructions belonging to this class can be

executed conditionally, as described earlier. The specified condition is valid only for the B field of

the instruction, and is not valid for data transfer instructions for which a parallel specification is

made. Examples are shown in figure 2.17.

DCT PADD X0,Y0,A0

MOVX.W @R4+,X0

MOVY.W A0,@R6+R9 ;

When condition is True

Before execution:

After execution:

X0=H'33333333, Y0=H'55555555, A0=H'123456789A,

R4=H'00008000, R6=H'00008233, R9=H'00000004

(R4)=H'1111, (R6)=H'2222

X0=H'11110000, Y0=H'55555555, A0=H'0088888888,

R4=H'00008002, R6=H'00008237, R9=H'00000004

(R4)=H'1111, (R6)=H'3456

When condition is False

Before execution:

After execution:

X0=H'33333333, Y0=H'55555555, A0=H'123456789A,

R4=H'00008000, R6=H'00008233, R9=H'00000004

(R4)=H'1111, (R6)=H'2222

X0=H'11110000, Y0=H'55555555, A0=H'123456789A,

R4=H'00008002, R6=H'00008237, R9=H'00000004

(R4)=H'1111, (R6)=H'3456

Figure 2.17 Examples of Conditional Operations and Data Transfer Instructions

Assignment of NOPX and NOPY Instruction Codes: When there is no data transfer instruction

to be parallel-processed simultaneously with a DSP operation instruction, an NOPX or NOPY

instruction can be written as the data transfer instruction, or the instruction can be omitted. The

instruction code is the same whether an NOPX or NOPY instruction is written or the instruction is

omitted. Examples of NOPX and NOPY instruction codes are shown in table 2.34.

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