SH7101 datasheet(55/560 Pages) RENESAS

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Section 2 CPU

Rev.1.00 Sep. 18, 2008 Page 21 of 522

REJ09B0069-0100

Table 2.3

Delayed Branch Instructions

CPU of This LSI

Description

Example of Conventional CPU

BRA

TRGET

ADD

R1,R0

Executes the ADD before

branching to TRGET.

ADD.W

R1,R0

BRA

TRGET

Multiply/Multiply-and-Accumulate Operations: 16-bit

× 16-bit → 32-bit multiply operations

are executed in one to two states. 16-bit

× 16-bit + 64-bit → 64-bit multiply-and-accumulate

operations are executed in two to three states. 32-bit

× 32-bit → 64-bit multiply and 32-bit × 32-bit

+ 64-bit

→ 64-bit multiply-and-accumulate operations are executed in two to four states.

T Bit: The T bit in the status register changes according to the result of the comparison. Whether a

conditional branch is taken or not taken depends upon the T bit condition (true/false). The number

of instructions that change the T bit is kept to a minimum to improve the processing speed.

Table 2.4

T Bit

CPU of This LSI

Description

Example of Conventional CPU

CMP/GE

R1,R0

TRGET0

TRGET1

T bit is set when R0

≥ R1. The

program branches to TRGET0

when R0

≥ R1 and to TRGET1

when R0 < R1.

CMP.W

R1,R0

BGE

TRGET0

BLT

TRGET1

ADD

−1,R0

CMP/EQ

#0,R0

TRGET

T bit is not changed by ADD. T bit is

set when R0 = 0. The program

branches if R0 = 0.

SUB.W

#1,R0

BEQ

TRGET

Immediate Data: Byte (8-bit) immediate data is located in an instruction code. Word or longword

immediate data is not located in instruction codes but in a memory table. An immediate data

transfer instruction (MOV) accesses the memory table using the PC relative addressing mode with

displacement.

Table 2.5

Immediate Data Accessing

Classification

CPU of This LSI

Example of Conventional CPU

8-bit immediate

MOV

#H'12,R0

MOV.B

#H'12,R0

16-bit immediate

MOV.W

@(disp,PC),R0

.................

.DATA.W

H'1234

MOV.W

#H'1234,R0

32-bit immediate

MOV.L

@(disp,PC),R0

.................

.DATA.L

H'12345678

MOV.L

#H'12345678,R0

Note:

@(disp, PC) accesses the immediate data.

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