Renesas SH7781 用户手册
9. On-Chip Memory
Rev.1.00 Jan. 10, 2008 Page 247 of 1658
REJ09B0261-0100
9.2.1
On-Chip Memory Control Register (RAMCR)
RAMCR controls the protective functions in the on-chip memory.
When updating RAMCR, please follow limitation described at section 8.2.4, On-Chip Memory
Control Register (RAMCR).
Control Register (RAMCR).
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Bit :
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
RMD
RP
IC2W OC2W
Initial value :
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/W:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit :
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Initial value :
R
R
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R/W:
ICWPD
Bit Bit
Name
Initial
Value R/W
Value R/W
Description
31to10 —
All
0
R
Reserved
For read/write in these bits, refer to General
Precautions on Handling of Product.
Precautions on Handling of Product.
9
RMD
0
R/W
On-Chip Memory Access Mode
Specifies the right of access to the on-chip memory
from the virtual address space.
from the virtual address space.
0: An access in privileged mode is allowed.
(An address error exception occurs in user mode.)
1: An access in user/ privileged mode is allowed.
8
RP
0
R/W
On-Chip Memory Protection Enable
Selects whether or not to use the protective functions
using ITLB and UTLB for accessing the on-chip
memory from the virtual address space.
using ITLB and UTLB for accessing the on-chip
memory from the virtual address space.
0: Protective functions are not used.
1: Protective functions are used.
For further details, refer to section 9.4, On-Chip
Memory Protective Functions.
Memory Protective Functions.
7
IC2W
0
R/W
IC Two-Way Mode
For further details, refer to section 8.4.3, IC Two-Way
Mode.
Mode.