r5s72060w200fpv Renesas Electronics Corporation., r5s72060w200fpv Datasheet - Page 208
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r5s72060w200fpv
Manufacturer Part Number
r5s72060w200fpv
Description
32-bit Risc Microcomputer Superhtm Risc Engine Family / Sh7200 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5S72060W200FPV.pdf
(1180 pages)
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Section 7 Cache
7.2.2
CCR2 is used to enable or disable the cache locking function for operand cache and is valid in
cache locking mode only. In cache locking mode, the lock enable bit (the LE bit) in CCR2 is set to
1. In non-cache-locking mode, the cache locking function is invalid.
When a cache miss occurs in cache locking mode by executing the prefetch instruction (PREF
@Rn), the line of data pointed to by Rn is loaded into the cache according to bits 9 and 8 (the
W3LOAD and W3LOCK bits) and bits 1 and 0 (the W2LOAD and W2LOCK bits) in CCR2. The
relationship between the setting of each bit and a way, to be replaced when the prefetch instruction
is executed, are listed in table 7.3. On the other hand, when the prefetch instruction is executed
and a cache hit occurs, new data is not fetched and the entry which is already enabled is held. For
example, when the prefetch instruction is executed with W3LOAD = 1 and W3LOCK = 1
specified in cache locking mode while one-line data already exists in way 0 which is specified by
Rn, a cache hit occurs and data is not fetched to way 3.
In the cache access other than the prefetch instruction in cache locking mode, ways to be replaced
by bits W3LOCK and W2LOCK are restricted. The relationship between the setting of each bit in
CCR2 and ways to be replaced are listed in table 7.4.
Programs that change the contents of CCR2 should be placed in a cache-disabled space, and a
cache-enabled space should be accessed after reading the contents of CCR2.
CCR2 is initialized to H'00000000 by a power-on reset but not initialized by a manual reset or in
software standby mode.
Initial value:
Initial value:
Rev. 2.00 Dec. 09, 2005 Page 184 of 1152
REJ09B0191-0200
Note:
R/W:
R/W:
Bit:
Bit:
*
Cache Control Register 2 (CCR2)
The W3LOAD and W2LOAD bits should not be set to 1 at the same time.
31
15
R
R
0
0
-
-
30
14
R
R
0
0
-
-
29
13
R
R
0
0
-
-
28
12
R
R
0
0
-
-
27
11
R
R
0
0
-
-
26
10
R
R
0
0
-
-
LOAD*
R/W
W3
25
R
0
9
0
-
LOCK
R/W
W3
24
R
0
8
0
-
23
R
R
0
7
0
-
-
22
R
R
0
6
0
-
-
21
R
R
0
5
0
-
-
20
R
R
0
4
0
-
-
19
R
R
0
3
0
-
-
18
R
R
0
2
0
-
-
LOAD*
R/W
W2
17
R
0
1
0
-
LOCK
R/W
R/W
16
W2
LE
0
0
0
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