SH7206 Datasheet, PDF (286/1188 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 8 Bus State Controller (BSC)
8.4.9 AC Characteristics Switching Key Register (ACKEYR)
ACKEYR is a write only 8-bit register to access the AC characteristics switching register
(ACSWR). The write value is ignored and the read value is undefined.
Bit: 7
6
5
4
3
2
1
0
ACKEY[7:0]
Initial value: -
-
-
-
-
-
-
-
R/W: W W W W W W W W
Bit
7 to 0
Bit Name
Initial
Value
ACKEY[7:0] 
R/W Description
W AC Key
Writing to this bit is required to write to the ACSWR
register. The write value is arbitrary.
Rev. 3.00 Jun. 18, 2008 Page 262 of 1160
REJ09B0191-0300