PXN20RM Datasheet, PDF (206/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

System Integration Unit (SIU)
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.
PA Field
0b00
0b01
0b10
0b11
Pin Function
GPIO
Function 1
Function 2
Function 3
OBE
IBE
DSC
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.
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.
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.
DSC
Drive Strength
0b00
0b01
0b10
0b11
10 pF Drive Strength
20 pF Drive Strength
30 pF Drive Strength
50 pF Drive Strength
ODE
HYS
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.
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.
Input Hysteresis. Controls whether hysteresis is enabled for the pad.
0 Hysteresis disabled for the pad.
1 Hysteresis enabled for the pad.
8-24
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor