R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 256

• Manufacturer Part Number: R0K572030S000BE
• Description: KIT DEV FOR SH7203
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572030S000BE

• Contents: CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM
• Silicon Manufacturer: Renesas
• Kit Contents: Board
• Silicon Family Name: SH7203
• Silicon Core Number: R5S72030W200FP
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: SH7203
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SH7203
• Lead Free Status / Rohs Status: Compliant

Section 8 Cache
8.2.2
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 8.3. 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 8.4.
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.
Initial value:
Initial value:
Rev. 3.00 Sep. 28, 2009 Page 224 of 1650
REJ09B0313-0300
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
17
W2
R
0
1
0
-
LOCK
R/W
R/W
W2
16
LE
0
0
0