HD6417618A datasheet(57/646 Pages) RENESAS

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Section 2 CPU

Rev. 6.00 Jun. 12, 2007 Page 25 of 610

REJ09B0131-0600

2.3.3

Immediate Data Formats

Immediate data of eight bits is placed in the instruction code.

For the MOV, ADD, and CMP/EQ instructions, the immediate data is sign-extended to longword

and then calculated. For the TST, AND, OR, and XOR instructions, the immediate data is zero-

extended to longword and then calculated. Thus, if the immediate data is used for the AND

instruction, the upper 24 bits in the destination register are always cleared.

The immediate data of word or longword is not placed in the instruction code. It is placed in a

table in memory. The table in memory is accessed by the MOV immediate data instruction in PC

relative addressing mode with displacement.

2.4

Features of Instructions

2.4.1

RISC Type

The instructions are RISC-type instructions with the following features:

Fixed 16-Bit Length: All instructions have a fixed length of 16 bits. This improves program code

efficiency.

One Instruction per Cycle: Since pipelining is used, basic instructions can be executed in one

cycle. One cycle is 25ns with 40 MHz operation.

Data Size: The basic data size for operations is longword. Byte, word, or longword can be

selected as the memory access size. Byte or word data in memory is sign-extended to longword

and then calculated. Immediate data is sign-extended to longword for arithmetic operations or

zero-extended to longword size for logical operations.

Table 2.2

Word Data Sign Extension

CPU in this LSI

Description

Example of Other CPUs

MOV.W

@(disp,PC),R1

ADD

R1,R0

........

.DATA.W H'1234

Sign-extended to 32 bits, R1

becomes H'00001234, and is

then operated on by the ADD

instruction.

ADD.W #H'1234,R0

Note:

Immediate data is accessed by @(disp,PC).

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