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System Control Module (SCM)
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
12-14 Freescale Semiconductor
12.7.3.1 Master Privilege Register (MPR)
The MPR specifies the access privilege level associated with each bus master in the platform. The register
provides one bit per bus master. Bit 3 is reserved and should be cleared. Bits 2:0 correspond to master 2
(DMA Controller), master 1 (internal bus master), and master 0 (ColdFire core), respectively.
Only trusted bus masters can modify the access control registers. If a non-trusted bus master attempts to
write any of the SACU control registers, the access is aborted with an error termination and the registers
remain unaffected.
The processor core is connected to bus master 0 and is always treated as a trusted bus master. Accordingly,
MPR[0] is forced to 1 at reset.
12.7.3.2 Peripheral Access Control Registers (PACR0–PACR8)
Access to several on-chip peripherals is controlled by shared peripheral access control registers. A single
PACR defines the access level for each of the two modules. These modules only support operand reads
and writes. Each PACR follows the format illustrated in Figure 12-9. For a list of PACRs and the modules
that they control, refer to Table 12-12.
0x034 — — — —
0x038 — — — —
0x03C — — — —
IPSBAR
Offset: 0x0020 (MPR)
Access: read/write
76543210
R 0 0 0 0
MPR[3:0]
W
Reset:00000001
Figure 12-8. Master Privilege Register (MPR)
Table 12-9. MPR[n] Field Descriptions
Field Description
7–4 Reserved. Should be cleared.
3–0
MPR
Each 1-bit field defines the access privilege level of the given bus master n.
0 All bus master accesses are in user mode.
1 All bus master accesses use the sourced user/supervisor attribute.
Note: Bit 3 is reserved and should be cleared.
Table 12-8. SACU Register Memory Map (continued)
IPSBAR
Offset
[31:28] [27:24] [23:20] [19:16] [15:12] [11:8] [7:4] [3:0]