NXP Semiconductors MPC5644A Reference Manual page 401

Field
— Reserved fields are indicated by shading in the register maps.
PA Pin assignment
Selects the function of a multiplexed pad.
1,2
OBE Output buffer enable
Enables the pad as an output and drives the output buffer enable signal.
0 Disable output buffer for the pad.
1 Enable output buffer for the pad is enabled.
1,2
IBE Input buffer enable
Enables the pad as an input and drives the input buffer enable signal.
0 Disable input buffer for the pad.
1 Enable input buffer for the pad is enabled.
For all PCRs where GPIO function is available on the pin, if the pin is configured as an output and the
IBE bit is set, the actual value of the pin will be reflected in the corresponding GPDIx_x register. Negating
the IBE bit when the pin is configured as an output will reduce noise and power consumption.
3
DSC Drive strength control
Controls the pad drive strength. Drive strength control pertains to pins with the fast I/O pad type.
00 10 pF drive strength
01 20 pF drive strength
10 30 pF drive strength
11 50 pF drive strength
3
ODE Open drain output enable
Controls output driver configuration for the pads. Either open drain or push/pull driver configurations can
be selected. This feature applies to output pins only.
0 Disable open drain for the pad (push/pull driver enabled).
1 Enable open drain for the pad.
Freescale Semiconductor
Table 16-18. SIU_PCR field description
1
PA value
0b0001
0b0010
0b0100
0b1000
0b0000
1
Depending on the register, the PA field size can vary in length.
For PA fields having fewer than four bits, remove the
appropriate number of leading zeroes from these values.
MPC5644A Microcontroller Reference Manual, Rev. 6
Description
Pin function
P Primary function
A1 Alternate function 1
A2 Alternate function 2
A3 Alternate function 3
G GPIO
System Integration Unit (SIU)
401