SH7670 Datasheet, PDF (240/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 7 Bus State Controller (BSC)
7.4.10 Sequence to Write to ACSWR
Figure 7.2 shows the sequence to write to ACSWR. Write must be executed in the on-chip RAM.
Main program routine
Subroutine executed in on-chip RAM
Write subroutine
Byte write to ACKEYR ⁽¹⁾
Transfer write subroutine
to on-chip RAM
Execute write
subroutine
Byte write to ACKEYR ⁽²⁾
Longword write
to ACSWR
(3)
Read ACSWR
to confirm
(4)
Incorrectly written
Correcrly written
Return
Make sure to read and confirm as in step (4) after the write in step (3).
If incorrectly written, execute from step (1) again.
Figure 7.2 Recommended Sequence to Write to ACSWR
Rev. 1.00 Nov. 14, 2007 Page 214 of 1262
REJ09B0437-0100