MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 5-7
5.3.1.2 Peripheral Access Control Registers (PBRIDGE_x_PACR) and
Off-Platform Peripheral Access Control Registers (PBRIDGE_x_OPACR)
Each of the PBRIDGE on-platform peripherals has a 4-bit access field in a peripheral access control
register (PACR) that defines the access levels supported by the given module. A single PACR contains up
to eight of these module-access fields, and the PACR register structure is shown in Table 5-2 and
Table 5-3. The PACR registers with their access fields are shown in Figure 5-3. There are three PACR
registers, one for bridge A and two for bridge B.
Also, each of the off-platform peripherals has a 4-bit access field in an off-platform peripheral access
control register (PBRIDGE_x_OPACR) that defines the access levels supported by the given module.
13 MTR3 Master trusted for reads. Determines whether the EBI is trusted for read accesses. Trusted
by default.
0 The EBI is not trusted for read accesses.
1 The EBI is trusted for read accesses.
14 MTW3 Master trusted for writes. Determines whether the master is trusted for write accesses.
Trusted by default.
0 The EBI is not trusted for write accesses.
1 The EBI is trusted for write accesses.
15 MPL3 Master privilege level. Determines how the privilege level of the EBI is determined.
Accesses not forced to user mode by default.
0 Accesses from the EBI are forced to user mode.
1 Accesses from the EBI are not forced to user mode.
16 MBW4
1
Master buffer writes. Determines whether the PBRIDGE is enabled to buffer writes from
the FEC. Writes not able to be buffered by default.
0 Write accesses from the FEC are not bufferable
1 Write accesses from the FEC are allowed to be buffered
Note: Applies only to MPC5553. Reserved in MPC5554.
17 MTR4
1
Master trusted for reads. Determines whether the FEC is trusted for read accesses.
Trusted by default.
0 The FEC is not trusted for read accesses.
1 The FEC is trusted for read accesses.
Note: Applies only to MPC5553. Reserved in MPC5554.
18 MTW4
1
Master trusted for writes. Determines whether the master is trusted for write accesses.
Trusted by default.
0 The FEC is not trusted for write accesses.
1 The FEC is trusted for write accesses.
Note: Applies only to MPC5553. Reserved in MPC5554.
19 MPL4
1
Master privilege level. Determines how the privilege level of the FEC is determined.
Accesses not forced to user mode by default.
0 Accesses from the FEC are forced to user mode.
1 Accesses from the FEC are not forced to user mode.
Note: Applies only to MPC5553. Reserved in MPC5554.
20–31 — Reserved.
1
Applies only to MPC5553. Reserved in MPC5554.
Table 5-4. PBRIDGE_x_MPCR Field Descriptions (Continued)
Bits Name Description
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