Parallel I/O Ports
MPC885 PowerQUICC Family Reference Manual, Rev. 2
34-20
Freescale Semiconductor
34.5.1.3
Port D Pin Assignment Register (PDPAR)
The ATM and UT bits are included in the PDPAR register, shown in
Figure 34-18
. The PDPAR register is
cleared at system reset.
The fields in the PDPAR register are described in
Table 34-21
.
34.6
Port E
All port E signals can be open-drain. They are configured independently as general-purpose I/O signals if
the corresponding bit in the PEPAR is cleared, and they are configured as dedicated on-chip peripheral
signals if the corresponding PEPAR bit is set. When configured as a general-purpose I/O signal, the
direction of that pin is determined by the corresponding control bit in the PEDIR. The port I/O signal is
configured as an input if the corresponding PEDIR bit is cleared, and it is configured as an output if the
corresponding PEDIR bit is set. All PEPAR bits and PEDIR bits are cleared by hardware reset, thus
configuring all port E signals as general-purpose inputs.
Table 34-22
describes port E signal options.
If a port E signal is selected as a general-purpose I/O signal, it can be accessed through the PEDAT where
data is stored in an output latch. If a port E signal is configured as an output, the output latch data is gated
onto the port signal. When PEDAT is read, the port signal itself is read.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field ATM
UT
—
DD3
DD4
DD5
DD6 DD7
DD8
DD9 DD10 DD11 DD12 DD13 DD14 DD15
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Oper
R/W
Addr
OFFSET TO IMMR: 0X972 (PDPAR)
Figure 34-18. Port D Pin Assignment Register (PDPAR)
Table 34-21. PDPAR Field Descriptions
Bits
Name
Description
0
ATM ATM
global
enable
0 =Disable ATM SAR functionality
1 =Enable ATM SAR functionality
1
UT
UTOPIA enable. Determines whether the parameter RAM’s page 4 (SCC4) operates in serial or
UTOPIA mode.
0 =Serial mode using SCC4
1 = UTOPIA mode
2
—
Reserved
3–15
DD
n
Signal assignment. Determines whether the signal is a general-purpose I/O signal or performs a
dedicated function.
0 =General-purpose I/O. The peripheral functions of the signal are not used.
1 =Dedicated peripheral function. The signal performs the function assigned by the internal
module.
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