r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 495

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

12.4.6
This register indicates the DDR-SDRAM back-up status. For details, see section 18, Power-Down
Mode.
Initial value:
Initial value:
Initial value:
Initial value:
Note:
Bit
63 to 1
0
R/W:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Bit:
*
DDR-SDRAM Back-up Register (DBK)
Bit Name

SDBUP
Depends on the setting of external pin BKPRST.
63
47
31
15
R
R
R
R
0
0
0
0
62
46
30
14
R
R
R
R
0
0
0
0
Initial
Value
All 0
Undefined
61
45
29
13
R
R
R
R
0
0
0
0
60
44
28
12
R
R
R
R
0
0
0
0
* R
59
43
27
11
R/W
R
R
R
R
R
0
0
0
0
58
42
26
10
R
R
R
R
0
0
0
0
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Determine whether DDR-SDRAM is battery back-up or
not
0: Battery back-up
1: Not back-up
57
41
25
R
R
R
R
0
0
0
0
9
56
40
24
R
R
R
R
0
0
0
8
0
55
39
23
R
R
R
R
0
0
0
7
0
Section 12 DDR-SDRAM Interface (DDRIF)
Rev. 1.00 Oct. 01, 2007 Page 429 of 1956
54
38
22
R
R
R
R
0
0
0
6
0
53
37
21
R
R
R
R
0
0
0
5
0
52
36
20
R
R
R
R
0
0
0
4
0
51
35
19
R
R
R
R
0
0
0
3
0
REJ09B0256-0100
50
34
18
R
R
R
R
0
0
0
2
0
49
33
17
R
R
R
R
0
0
0
1
0
SDBUP
47
32
16
R
R
R
R
0
0
0
0