System Integration Unit (SIU)
PXN20 Microcontroller Reference Manual, Rev. 1
8-24 Freescale Semiconductor
Table 8-16. SIU_PCR Field Descriptions
Field Description
PA Pin Assignment. Selects a multiplexed pad function. A separate port enable output signal from the SIU is asserted
for each register value.
OBE Output Buffer Enable. Enables the pad as an output and drives the output buffer enable signal.
0 Output buffer for the pad disabled.
1 Output buffer for the pad enabled.
IBE Input Buffer Enable. Enables the pad as an input and drives the input buffer enable signal.
0 Input buffer for the pad disabled.
1 Input buffer for the pad enabled.
DSC Drive Strength Control. Controls the drive strength control output signals from the SIU. The output signals are driven
to the value of this field. The actual drive strengths are defined by the implementation of the pad devices for a given
device.
Note: DSC is applicable to fast pads only. See Table 3- 1 in Section 3.4, Detailed Signal Description, for a listing of
pad types.
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 only when pins are configured as outputs.
0 Open drain disabled for the pad (push/pull driver enabled).
1 Open drain enabled for the pad.
HYS Input Hysteresis. Controls whether hysteresis is enabled for the pad.
0 Hysteresis disabled for the pad.
1 Hysteresis enabled for the pad.
PA Field Pin Function
0b00 GPIO
0b01 Function 1
0b10 Function 2
0b11 Function 3
DSC Drive Strength
0b00 10 pF Drive Strength
0b01 20 pF Drive Strength
0b10 30 pF Drive Strength
0b11 50 pF Drive Strength
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