r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 286

• Manufacturer Part Number: r5s72060w200fpv
• Description: 32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 Bus State Controller (BSC)
8.4.8
To use the SDRAM in clock mode 2, set the AC characteristics switching register (ACSWR) and
AC characteristics key switching register (ACKEYR). In clock mode 7, set nothing to keep the
initial value.
ACSWR is initialized to H'00000000 by a power-on reset, but not initialized and retains the value
by a manual reset or in software standby mode. Only a special sequence can write to this register
to prevent accidental erroneous write. The setting procedure is shown in section 8.4.10, Sequence
to Write to ACSWR. Read is done by the normal longword.
Initial value:
Initial value:
Rev. 2.00 Dec. 09, 2005 Page 262 of 1152
REJ09B0191-0200
Bit
31 to 4
3 to 0
R/W:
R/W:
Bit:
Bit:
AC Characteristics Switching Register (ACSWR)
31
15
Bit Name

ACOSW[3:0] 0000
R
R
0
0
-
-
30
14
R
R
0
0
-
-
29
13
R
R
0
0
-
-
Initial
Value
All 0
28
12
R
R
0
0
-
-
27
11
R
R
0
0
-
-
R/W
R
R/W
26
10
R
R
0
0
-
-
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
AC Characteristics Switch
Specifies AC characteristics switching
0000: Not extend the delay time
1001: Switches characteristics and extends the delay
Others: Setting prohibited
25
R
R
0
9
0
-
-
time
24
R
R
0
8
0
-
-
23
R
R
0
7
0
-
-
22
R
R
0
6
0
-
-
21
R
R
0
5
0
-
-
20
R
R
0
4
0
-
-
R/W
19
R
0
3
0
-
R/W
ACOSW[3:0]
18
R
0
2
0
-
R/W
17
R
0
1
0
-
R/W
16
R
0
0
0
-