Renesas R5S72621 User Manual

 
Section 9   Bus State Controller 
 

Page 290 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

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