Rev. 2.00, 09/03, page 96 of 690
4.2.1
Cache Control Register 1 (CCR1)
The cache is enabled or disabled using the CE bit in CCR1. CCR1 also has a CF bit (which
invalidates all cache entries), and WT and CB bits (which select either write-through mode or
write-back mode). Programs that change the contents of the CCR1 register should be placed in
address space that is not cached.
Bit
Bit
Name
Initial
Value
R/W
Description
31 to 4
—
0
R
Reserved
These bits are always read as 0. The write value
should always be 0.
3
CF
0
R/W
Cache Flush
Writing 1 flushes all cache entries (clears the V, U,
and LRU bits of all cache entries to 0). This bit is
always read as 0. Write-back to external memory is
not performed when the cache is flushed.
2
CB
0
R/W
Write-Back
Indicates the cache’s operating mode for space P1.
0: Write-through mode
1: Write-back mode
1
WT
0
R/W
Write-Through
Indicates the cache’s operating mode for spaces P0,
U0, and P3.
0: Write-back mode
1: Write-through mode
0
CE
0
R/W
Cache Enable
Indicates whether the cache function is used.
0: The cache function is not used.
1: The cache function is used.
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