r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 1025
r5f71374an80fpv
Manufacturer Part Number
r5f71374an80fpv
Description
32-bit Risc Microcomputer Superh?? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5F71374AN80FPV.pdf
(1154 pages)
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24.3.7
RAMCR is an 8-bit readable/writable register that enables/disables the access to the on-chip
RAM.
Bit
7 to 5
4
3 to 0
RAM Control Register (RAMCR)
Bit Name
RAME
Initial value:
Initial
Value
All 0
1
All 0
R/W:
Bit:
R
7
0
-
R/W
R
R/W
R
R
6
0
-
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
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.
Reserved
These bits are always read as 0. The write value should
always be 0.
R
5
0
-
RAME
R/W
4
1
R
3
0
-
Rev. 1.00 Sep. 21, 2007 Page 999 of 1124
R
2
0
-
R
1
0
-
Section 24 Power-Down Modes
R
0
0
-
REJ09B0402-0100
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