NXP Semiconductors MPC5644A Reference Manual page 417

Signal
Primary
ALT2
GPIO
1
In cases where an I/O function can be either an input or an output, I/O direction is specified using
the IBE and OBE bits. Set IBE = 1 for input or OBE = 1 for output.
2
For I/O functions that change direction dynamically, such as the external data bus, switching
between input and output is handled internally and the IBE and OBE bits are ignored.
16.6.15.21 Pad Configuration Register 24 (SIU_PCR24)
SIU_BASE+0x70
0 1
R
0 0
W
Reset
0 0
= Unimplemented or Reserved
1
When configured as ADDR[28] or DATA[28] the OBE bit has no effect. When configured as GPO, the OBE bit
should be set to one.
2
When configured as ADDR[28], DATA[28] or GPO, the IBE bit may be set to one to reflect the pin state in the
corresponding GPDI register. Setting the IBE bit to zero reduces power consumption. When configured as GPI, the
IBE bit should be set to one.
3
When configured as ADDR[28] or DATA[28], the ODE bit should be set to zero.
4
See the EBI section for weak pull up settings when configured as ADDR[28] or DATA[28].
Signal
Primary
ALT2
GPIO
1
In cases where an I/O function can be either an input or an output, I/O direction is specified using
the IBE and OBE bits. Set IBE = 1 for input or OBE = 1 for output.
2
For I/O functions that change direction dynamically, such as the external data bus, switching
between input and output is handled internally and the IBE and OBE bits are ignored.
Freescale Semiconductor
Table 16-38. SIU_PCR23 PA values
Name Module
ADDR[27] EBI
DATA[27] EBI
GPIO[23] SIU
2 3 4 5 6
1
0 PA OBE
0 0 0 0 0
Figure 16-36. Pad Configuration Register (SIU_PCR24)
Table 16-39. SIU_PCR24 PA values
Name Module
ADDR[28] EBI
DATA[28] EBI
GPIO[24] SIU
MPC5644A Microcontroller Reference Manual, Rev. 6
1,2
Description I/O
Address bus I/O
Data bus I/O
GPIO I/O
7 8 9 10 11
2 3
IBE 0 0 ODE HYS
0 0 0 0 0
1,2
Description I/O
Address bus I/O
Data bus I/O
GPIO I/O
System Integration Unit (SIU)
PA value
0b001
0b100
0b000
12 13 14 15
4 4
SRC WPE WPS
0 0 1 1
PA value
0b001
0b100
0b000
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