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Chapter 4
Bus Control Function
Preliminary User’s Manual U15839EE1V0UM00
4.7 Cache
Configuration
The cache configuration register (BHC) is used to set the cache memory configuration for each CS
area selected by the chip select signals (CS0 to CS7).
(1)
Cache configuration register (BHC)
This register can be read or written in 16-bit units.
Cautions: 1. Be sure to disable the cache for big endian format CS area and CS areas set as
the following areas.
•
ROM area
•
RAM area
•
Peripheral I/O area
•
Programmable peripheral I/O area
2. The bits marked as 0 are reserved. They have to leave to 0
Note: n = 0 to 7
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
BEC
0
BH70
0
BH60
0
BH50
0
BH40
0
BH30
0
BH20
0
BH10
0
BH00
FFFFF06AH
0000H
CS7
CS6
CS5
CS4
CS3
CS2
CS1
CS0
Bit Position
Bit Name
Function
14, 12, 10, 8,
6, 4, 2, 0
BHn0
(n = 0 to 7)
Sets whether or not the instruction cache located in the block n area can be
used.
BHn0
Instruction Cache Setting
0
Cache not available
1
Cache
available
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