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SH7708 Fiches technique(PDF) 68 Page - Renesas Technology Corp

No de pièce SH7708
Description  SuperH??RISC engine
PDF  633 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 Fiches technique(HTML) 68 Page - 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
4n
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
or
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*
2)
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.



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