NXP Semiconductors MPC5644A Reference Manual page 460

System Integration Unit (SIU)
Only the output channels of the ETPU_A[12:23] signals are connected to
pins. Both the input and output channels of the ETPU_A[0:11] signals are
connected to pins.
16.6.15.78.1 Pad Configuration Register 114 (SIU_PCR114)
SIU_BASE+0x124
0 1
R
0 0
W
Reset
0 0
= Unimplemented or Reserved
1
The OBE bit must be set to one for both ETPU_A[0] and GPIO[114] when configured as outputs.
2
The IBE bit must be set to one for both ETPU_A[0] and GPIO[114] when configured as inputs. When configured as
ETPU_A[12] or ETPU_A[19] or when ETPU_A[0] or GPIO[114] are configured as outputs, the IBE bit may be set
to one to reflect the pin state in the corresponding GPDI register.
3
The weak pull up/down selection at reset for the ETPU_A[0] pin is determined by the WKPCFG pin.
Signal
Primary ETPU_A[0]
ALT1 ETPU_A[12]
ALT2 ETPU_A[19]
GPIO GPIO[114]
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.
460
2 3 4 5 6
0 PA OBE
0 0 0 0 0
Figure 16-100. Pad Configuration Register (SIU_PCR114)
Table 16-103. SIU_PCR114 PA values
Name Module
eTPU
eTPU
eTPU
SIU
MPC5644A Microcontroller Reference Manual, Rev. 6
NOTE
7 8 9 10
1 2
IBE 0 0 ODE
0 0 0 0
Description
eTPU channel I/O
eTPU channel O
eTPU channel O
GPIO I/O
11 12 13 14 15
HYS SRC WPE WPS
0 0 0 1 WKP
1,2
I/O PA value
0b001
0b010
0b100
0b000
Freescale Semiconductor
3