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System Integration Unit (SIU)
16.6.15.25 Pad Configuration Register 28 (SIU_PCR28)
SIU_BASE+0x78
0
1
R
0
0
W
Reset
0
0
= Unimplemented or Reserved
1
When configured as DATA[0] or ADDR[16] the OBE bit has no effect. When configured as GPO, the OBE bit should
be set to one.
2
When configured as DATA[0], ADDR[16] 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 DATA[0] or ADDR[16], the ODE bit should be set to zero.
4
See the EBI section for weak pull up settings when configured as DATA[0] or ADDR[16].
Signal
Primary
ALT1
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.
16.6.15.26 Pad Configuration Register 29 (SIU_PCR29)
SIU_BASE+0x7A
0
1
R
0
0
W
Reset
0
0
= Unimplemented or Reserved
1
When configured as DATA[1] or ADDR[17] the OBE bit has no effect. When configured as GPO, the OBE bit should
be set to one.
2
When configured as DATA[1], ADDR[17] 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 DATA[1] or ADDR[17], the ODE bit should be set to zero.
4
See the EBI section for weak pull up settings when configured as DATA[1] or ADDR[17].
420
2
3
4
5
6
1
0
0
PA
OBE
0
0
0
0
0
Figure 16-40. Pad Configuration Register (SIU_PCR28)
Table 16-43. SIU_PCR28 PA values
Name
Module
DATA[0]
EBI
ADDR[16]
EBI
GPIO[28]
SIU
2
3
4
5
6
1
0
0
PA
OBE
0
0
0
0
0
Figure 16-41. Pad Configuration Register (SIU_PCR29)
MPC5644A Microcontroller Reference Manual, Rev. 6
7
8
9
10
11
2
3
IBE
DSC
ODE
HYS
0
1
1
0
0
1,2
Description
I/O
Data bus
I/O
Address bus
I/O
GPIO
I/O
7
8
9
10
11
2
3
IBE
DSC
ODE
HYS
0
1
1
0
0
12
13
14
15
4
4
0
0
WPE
WPS
0
0
1
1
PA value
0b01
0b10
0b00
12
13
14
15
4
4
0
0
WPE
WPS
0
0
1
1
Freescale Semiconductor
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