NXP Semiconductors MPC5644A Reference Manual page 446

System Integration Unit (SIU)
16.6.15.57 Pad Configuration Register 91 (SIU_PCR91)
SIU_BASE+0xF6
0 1
R
0 0
W
Reset
0 0
= Unimplemented or Reserved
1
When configured as GPO, the OBE bit should be set to one.
2
When configured as SCI_B_TX, DSPI_D_PCS[1] or GPO, the IBE bit may be set to one to reflect the pin state in
the corresponding GPDI register. For SCI loop back operation the IBE bit must be set to one. Setting the IBE bit to
zero reduces power consumption. When configured as GPI, the IBE bit should be set to one.
Signal
Primary SCI_B_TX
ALT1 DSPI_D_PCS[1]
GPIO GPIO[91]
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.
16.6.15.58 Pad Configuration Register 92 (SIU_PCR92)
SIU_BASE+0xF8
0 1
R
0 0
W
Reset
0 0
= Unimplemented or Reserved
1
When configured as SCI_B_RX, the OBE bit has no effect. When configured as GPO, the OBE bit should be set to
one.
2
When configured as DSPI_D_PCS[5] or GPO, the IBE bit may be set to one to reflect the pin state in the
corresponding GPDI register. For SCI loop back operation the IBE bit must be set to one. Setting the IBE bit to zero
reduces power consumption. When configured as GPI, the IBE bit should be set to one.
Signal
Primary SCI_B_RX
446
2 3 4 5 6
1
0 0 PA OBE
0 0 0 0 0
Figure 16-79. Pad Configuration Register (SIU_PCR91)
Table 16-82. SIU_PCR91 PA values
Name Module
eSCI
DSPI
SIU
2 3 4 5 6
1
0 0 PA OBE
0 0 0 0 0
Figure 16-80. Pad Configuration Register (SIU_PCR92)
Table 16-83. SIU_PCR92 PA values
Name Module
eSCI
MPC5644A Microcontroller Reference Manual, Rev. 6
7 8 9 10 11
2
IBE 0 0 ODE HYS
0 0 0 0 0
Description I/O
eSCI transmit O
Chip select O
GPIO I/O
7 8 9 10 11
2
IBE 0 0 ODE HYS
0 0 0 0 0
Description I/O
eSCI receive I
12 13 14 15
SRC WPE WPS
0 0 1 1
1,2
PA value
0b01
0b10
0b00
12 13 14 15
SRC WPE WPS
0 0 1 1
1,2
PA value
0b01
Freescale Semiconductor