mcf5282 Freescale Semiconductor, Inc, mcf5282 Datasheet - Page 104

• Manufacturer Part Number: mcf5282
• Manufacturer: Freescale Semiconductor, Inc

Cache
4.2.2
The ACRs provide a definition of memory reference attributes for two memory regions (one per ACR).
This set of effective attributes is defined for every memory reference using the ACRs or the set of default
attributes contained in the CACR. The ACRs are examined for every processor memory reference not
mapped to the flash or SRAM memories.
The ACRs are 32-bit, write-only supervisor control register. They are accessed in the CPU address space
via the MOVEC instruction with an Rc encoding of 0x004 and 0x005. The ACRs can be read when in
background debug mode (BDM). Therefore, the register diagram,
system reset, both registers are disabled with ACRn[EN] cleared.
4-6
Reset – – – – – – – – – – – – – – – –
BDM: 0x004 (ACR0)
W
R
0x005 (ACR1)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15
CACR
[DISI]
Access Control Registers (ACR0, ACR1)
1
0
0
0
0
0
IPSBAR space should not be cached. The combination of the CACR
defaults and the two ACRn registers must define the non-cacheable attribute
for this address space.
AB
[DISD]
CACR
0
0
0
0
0
1
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
CACR
[INVI]
Table 4-4. Cache Invalidate All as Defined by CACR
0
0
1
1
x
x
Figure 4-3. Access Control Registers (ACRn)
[INVD]
CACR
AM
0
1
0
1
x
x
Split Instruction/
Data Cache
Split Instruction/
Data Cache
Split Instruction
Data Cache
Split Instruction/
Data Cache
Instruction Cache
Data Cache
Configuration
NOTE
EN
0
14
–
SM
13
–
Invalidate 2 KByte instruction cache
Invalidate all entries in 1-KByte instruction
cache and 1-KByte data cache
Invalidate only 1 KByte data cache
Invalidate only 1 KByte instruction cache
No invalidate
Invalidate 2 KByte data cache
12
0
0
11
0
0
Figure
10
0
0
9
0
0
Operation
4-3, is shown as read/write. At
0
0
8
0
0
7
CM BWE
6
–
Access: Supervisor write-only
Freescale Semiconductor
–
5
0
0
4
BDM read/write
0
0
3
WP
–
2
0
0
1
0
0
0