NXP Semiconductors MPC5644A, Reference Manual, Page: 446 / 1735

System Integration Unit (SIU)
MPC5644A Microcontroller Reference Manual, Rev. 6
446 Freescale Semiconductor
16.6.15.57 Pad Configuration Register 91 (SIU_PCR91)
Figure 16-79. Pad Configuration Register (SIU_PCR91)
16.6.15.58 Pad Configuration Register 92 (SIU_PCR92)
Figure 16-80. Pad Configuration Register (SIU_PCR92)
S0xF6
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
0 0 0 0 PA OBE
1
1
When configured as GPO, the OBE bit should be set to one.
IBE
2
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.
0 0 ODE HYS SRC WPE WPS
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
= Unimplemented or Reserved
Table 16-82. SIU_PCR91 PA values
Signal Name Module Description I/O
1,2
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.
PA value
Primary SCI_B_TX eSCI eSCI transmit O 0b01
ALT1 DSPI_D_PCS[1] DSPI Chip select O 0b10
GPIO GPIO[91] SIU GPIO I/O 0b00
S0xF8
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
0 0 0 0 PA OBE
1
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.
IBE
2
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.
0 0 ODE HYS SRC WPE WPS
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
= Unimplemented or Reserved
Table 16-83. SIU_PCR92 PA values
Signal Name Module Description I/O
1,2
PA value
Primary SCI_B_RX eSCI eSCI receive I 0b01