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Section 9 Bus State Controller
Page 290 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
9.4.10 Sequence to Write to ACSWR
Figure 9.2 shows the sequence to write to ACSWR. Write must be executed in the high-speed on-
chip RAM.
Main program routine Subroutine executed in high-speed on-chip RAM
(1)
(2)
(3)
(4)
Incorrectly written
Correcrly written
Make sure to read and confirm as in step (4) after the write in step (3).
If incorrectly written, execute from step (1) again.
Transfer write subroutine
to high-speed on-chip RAM
Write subroutine
Return
Byte write to ACKEYR
Byte write to ACKEYR
Longword write
to ACSWR
Read ACSWR
to confirm
Execute write
subroutine
Figure 9.2 Recommended Sequence to Write to ACSWR