SH7727 datasheet(154/1109 Pages) RENESAS

154 / 1109 page

Section 2 CPU

Rev. 5.00 Dec 12, 2005 page 82 of 1034

REJ09B0254-0500

Instruction

Instruction Code

Operation

Execu-

tion

States

T Bit

LDC.L

@Rn+,RE

0100nnnn01110111

(Rn)

→ RE, Rn + 4 → Rn

—

LDS

Rn,DSR

0100nnnn01101010

→ DSR

—

LDS

Rn,A0

0100nnnn01111010

→ A0

—

LDS

Rn,X0

0100nnnn10001010

→ X0

—

LDS

Rn,X1

0100nnnn10011010

→ X1

—

LDS

Rn,Y0

0100nnnn10101010

→ Y0

—

LDS

Rn,Y1

0100nnnn10111010

→ Y1

—

LDC

Rn,MOD

0100nnnn01011110

→ MOD

—

LDC

Rn,RS

0100nnnn01101110

→ RS

—

LDC

Rn,RE

0100nnnn01111110

→ RE

—

2.6.3

Single and Double Data Transfer for DSP Data Instructions

The new instructions in this class are provided to reduce the program code size for DSP

operations. All the new instructions in this class have a 16-bit code length. Instructions in this

class are divided into two groups: single data transfer instructions and double data transfer

instructions. The operand flexibility of the double data transfer instructions is the same as with the

A field in parallel instruction class data transfer instructions described in section 2.6.4, DSP

Operation Instruction Set. However, conditional load instructions cannot be used with these 16-bit

instructions. In single transfer, the Ax pointer and two other pointers are used as the As pointer,

but the Ay pointer is not used. Tables 2.27 and 2.28 list the single and double data transfer

instructions.

With double data transfer group instructions, X memory and Y memory can be accessed in

parallel. The Ax pointer can only be used by X memory access instructions, and the Ay pointer

only by Y memory access instructions. Double data transfer instructions can only access the on-

chip X and Y memory areas. Single data transfer instructions use a 16-bit instruction code, and can

access any memory address space.

Rn (n = 2 to 7) registers are normally used as the Ax, Ay, and As pointers. The pointer names

themselves can be changed with the assembler rename function. The following renaming scheme

is recommended.

R2:As2, R3:As3, R4:Ax0 (As0), R5:Ax1 (As1), R6:Ay0, R7:Ay1, R8:Ix, R9:Iy

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