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Cache
5-4
Freescale Semiconductor
5.2.2
Access Control Registers (ACR0–ACR1)
The access control registers (ACR
n
) assign control attributes, such as cache mode and write protection, to
specified memory regions. Registers are accessed with the MOVEC instruction with the encoding shown
in
For overlapping regions, ACR0 takes priority. Data transfers to and from these registers are longword
transfers. Bits 12–7, 4, 3, 1, and 0 are always read as zeros.
NOTE
Peripheral space (0xE000_0000–0xFFFF_FFFF) should not be cached. The
combination of the CACR defaults and the two ACR
n
registers must define
the non-cacheable attribute for this address space.
4
EUSP
Enable user stack pointer. See
Section 3.2.3, “Supervisor/User Stack Pointers (A7 and OTHER_A7)
,
”
for more
information on the dual stack pointer implementation.
0 Disable the processor’s use of the User Stack Pointer
1 Enable the processor’s use of the User Stack Pointer
3–0
Reserved, should be cleared.
BDM: 0x004 (ACR0)
0x005 (ACR1)
Access: MOVEC write-only
Debug read/write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
Address Base
Address Mask
E
S
0 0 0 0 0 0
CM
0 0
W
0 0
W
Reset – – – – – – – – – – – – – – – – 0 – – 0 0 0 0 0 0 – – 0 0 – 0 0
Figure 5-3. Access Control Register Format (ACRn)
Table 5-3. ACRn Field Descriptions
Field
Description
31–24
Address
Base
Address base. Compared with address bits A[31:24]. Eligible addresses that match are assigned the access control
attributes of this register.
23–16
Address
Mask
Address mask. Setting a mask bit causes the corresponding address base bit to be ignored. The low-order mask bits
can be set to define contiguous regions larger than 16 Mbytes. The mask can define multiple noncontiguous regions
of memory.
15
E
Enable. Enables or disables the other ACRn bits.
0 Access control attributes disabled
1 Access control attributes enabled
Table 5-2. CACR Field Descriptions (continued)
Field
Description
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...