Peripheral Bridge (PBRIDGE_A, PBRIDGE_B)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
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
. The PACR registers with their access fields are shown in
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.
Each OPACR contains up to eight of these module-access fields, and the OPACR register structure is
shown in
. The OPACR registers with their access fields are shown in
.
Seven OPACR registers are used, three for bridge A, and four for bridge B.
NOTE
Not all members of the MPC5500 family have PBRIDGE_x_PACR and
PBRIDGE_x_OPACR. On the devices that do not have them, writes to their
addresses receive a transfer error. To ensure code compatibility across all the
MPC55XX family of products, writes to those addresses must be qualified
with SIU_MIDR[PARTNUM].
NOTE
Write PBRIDGE_x_PACR and PBRIDGE_x_OPACR with a
read/modify/write for code compatibility.
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.
16-31
Reserved
Table 5-4. PBRIDGE_
x
_MPCR Field Descriptions (continued)
Field
Description
Содержание MPC5565
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