SH7670 Datasheet, PDF (239/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 7 Bus State Controller (BSC)
7.4.9 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. 1.00 Nov. 14, 2007 Page 213 of 1262
REJ09B0437-0100