System Integration Unit (SIU)
MPC5644A Microcontroller Reference Manual, Rev. 6
400
Freescale Semiconductor
Figure 16-14. IRQ Filtered Input Register (SIU_IFIR)
16.6.15 Pad Configuration Registers (SIU_PCR)
The Pad Configuration Registers (PCRs) select function, I/O direction and some electrical characteristics
for configurable device pins. Not all device pins are configurable.
PCRs are 16-bit registers but may be read or written as 32-bit values aligned on 32-bit address boundaries.
They are based on a common set of fields, but only the pertinent fields appear in each register.
The information in the following sections pertains to the bits and fields that are active for a given pin or
group of pins, and the reset state of the register. The reset state given for each PCR is the state prior to
execution of the BAM program. The BAM program may change certain PCRs based on the reset
configuration. See
Chapter 21, Boot Assist Module (BAM)
for more details.
The device is available in the packages listed in
controlled by the SIU PCRs are not available in the smaller packages. The port enable logic for these PCRs
is the same for PCRs that control I/O functions that are available in all packages. For the smaller packages
where some of the I/O functions are not available, the pad drivers are disabled in the pad interface logic.
The user should take care not to select the unavailable functions via the PA field. See
, for a definition of which I/O functions are available in each package.
lists and describes the fields contained in the PCRs. Not all fields appear in each PCR but each
field has an identical function in each register where it resides.
SI 0x2C
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
NM
IF
E
1
1
This bit is cleared only by a reset.
0
0
0
0
0
0
0
NM
IF
E
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
IF
E
E
15
IF
E
E
14
IF
E
E
13
IF
E
E
12
IFEE1
1
IF
E
E
10
IF
EE9
IF
EE8
IF
EE7
IF
EE6
IF
EE5
IF
EE4
IF
EE3
IF
EE2
IF
EE1
IF
EE0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Summary of Contents for MPC5644A
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