SH7708 datasheet(68/633 Pages) RENESAS

No. de pieza	SH7708

Descripción Electrónicos	SuperH??RISC engine

PDF	633 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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2.6

Usage Note

In the SH7708R, operations may not be performed correctly when the following sequences are

executed with the cache on.

Address

Instruction

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+2

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+4

STS(.L)/LDS(.L) MACH/MACL

4n+2

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+4

NOP (or one-cycle instruction except MAC instruction*

1 or branch

instruction*

4n+6

MAC.L (or MAC.W, DMULS.L, DMULU.L, MUL.L)

4n+8

STS(.L)/LDS(.L) MACH/MACL

Notes: 1. MULS.W, MULU.W, MAC.L, MAC.W, DMULS.L, DMULU.L, MUL.L, MULS.W,

MULU.W

2. BF, BF/S, BT, BT/S, BRA, BRAF, BSR, BSRF, JMP, JSR, RTS

Software Remedy: This problem can be avoided in either of the following ways.

1. Do not use the above sequences.

2. When performing STS/LDS on the MACL/MACH register after consecutive execution of MAC

instructions, insert an NOP instruction between the MAC instructions and STS/LDS

instruction.

SH7708 Datasheet(PDF) 68 Page - Renesas Technology Corp