Section 7 Memory Management Unit (MMU)
Rev.1.00 Dec. 13, 2005 Page 160 of 1286
REJ09B0158-0100
7.2.5
MMU Control Register (MMUCR)
The individual bits perform MMU settings as shown below. Therefore, MMUCR rewriting should
be performed by a program in the P1 or P2 area.
After MMUCR has been updated, execute one of the following three methods before an access
(including an instruction fetch) to the P0, P3, U0, or store queue area is performed.
1. Execute a branch using the RTE instruction. In this case, the branch destination may be the P0,
P3, or U0 area.
2. Execute the ICBI instruction for any address (including non-cacheable area).
3. If the R2 bit in IRMCR is 0 (initial value) before updating MMUCR, the specific instruction
does not need to be executed. However, note that the CPU processing performance will be
lowered because the instruction fetch is performed again for the next instruction after
MMUCR has been updated.
Note that the method 3 may not be guaranteed in the future SuperH Series. Therefore, it is
recommended that the method 1 or 2 should be used for being compatible with the future SuperH
Series.
MMUCR contents can be changed by software. However, the LRUI and URC bits may also be
updated by hardware.
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
Initial value:
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
TI
URB
LRUI
URC
SQMD
SV
AT
R
R
R/W
R
R/W
R/W:
Bit:
Initial value:
R/W:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Summary of Contents for SH7780 Series
Page 2: ...Rev 1 00 Dec 13 2005 Page ii of l ...
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Page 50: ...Rev 1 00 Dec 13 2005 Page l of l ...
Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
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Page 1340: ...SH7780 Hardware Manual ...