Section 19 Power-Down Modes
Rev. 3.00 Sep. 27, 2007 Page 668 of 758
REJ09B0243-0300
19.3.7
RAM Control Register (RAMCR)
RAMCR is an 8-bit readable/writable register that enables/disables the access to the on-chip
RAM.
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
0
0
0
1
0
0
0
0
R
R
R
R/W
R
R
R
R
RAME
-
-
-
-
-
-
-
Bit Bit
Name
Initial
Value
R/W Description
7 to 5
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
4 RAME
1 R/W
RAM
Enable
This bit enables/disables the on-chip RAM.
0: On-chip RAM disabled
1: On-chip RAM enabled
When this bit is cleared to 0, the access to the on-chip
RAM is disabled. In this case, an undefined value is
returned when reading or fetching the data or
instruction from the on-chip RAM, and writing to the on-
chip RAM is ignored.
When RAME is cleared to 0 to disable the on-chip
RAM, an instruction to access the on-chip RAM should
not be set next to the instruction to write RAMCR. If
such an instruction is set, normal access is not
guaranteed.
When RAME is set to 1 to enable the on-chip RAM, an
instruction to read RAMCR should be set next to the
instruction to write to RAMCR. If an instruction to
access the on-chip RAM is set next to the instruction to
write to RAMCR, normal access is not guaranteed.
3 to 0
All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
Summary of Contents for SH7124 R5F7124
Page 2: ...Rev 3 00 Sep 27 2007 Page ii of xx ...
Page 8: ...Rev 3 00 Sep 27 2007 Page viii of xx ...
Page 36: ...Section 1 Overview Rev 3 00 Sep 27 2007 Page 16 of 758 REJ09B0243 0300 ...
Page 68: ...Section 2 CPU Rev 3 00 Sep 27 2007 Page 48 of 758 REJ09B0243 0300 ...
Page 108: ...Section 5 Exception Handling Rev 3 00 Sep 27 2007 Page 88 of 758 REJ09B0243 0300 ...
Page 166: ...Section 7 User Break Controller UBC Rev 3 00 Sep 27 2007 Page 146 of 758 REJ09B0243 0300 ...
Page 724: ...Section 20 List of Registers Rev 3 00 Sep 27 2007 Page 704 of 758 REJ09B0243 0300 ...
Page 772: ...Rev 3 00 Sep 27 2007 Page 752 of 758 REJ09B0243 0300 ...
Page 778: ...Rev 3 00 Sep 27 2007 Page 758 of 758 REJ09B0243 0300 ...
Page 781: ......