PXD20RM Datasheet, PDF (1478/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

the number of alternate functions may or may not be present depending on the number of alternate
functions actually mapped on the pad.
Figure 43-11. Pad Configuration Register (PCR) for the different pad types in PXD20
Pad type
0123
Pad with slew
rate control
(F,M, and S)
Pad with
reduced slew
rate control
(SMD)
Pad with GPIO
and analog
functionality (J)
SMC APC
SMC APC
SMC APC
45678
PA[1:0] OBE IBE
PA[1:0] OBE IBE
PA[1:0] OBE IBE
9 10 11 12 13 14 15
ODE
SRC[1:0] WPE WPS
ODE
SRC WPE WPS
[1]
ODE
SRC[1:0] WPE WPS
Field
SMC
APC
PA[1:0]
OBE
IBE
Table 43-10. PCRx Field Descriptions
Description
Safe Mode Control
This bit supports the overriding of the automatic deactivation of the output buffer of the associated
pad upon entering SAFE mode of the SoC.
1: In SoC SAFE mode, the output buffer remains functional.
0: In SoC SAFE mode, the output buffer of the pad is disabled.
Analog Pad Control
This bit enables the usage of the pad as analog input.
1: Analog input path switch can be enabled by the ADC.
0: Analog input path from the pad is gated and can not be used.
Pad Output Assignment
This field is used to select the function to drive the output of a multiplexed pad. Note that for
non-GPIO functions the output buffer is automatically enabled when the function is selected.
00: Alternative Mode 0: GPIO.
01: Alternative Mode 1: see Chapter 3, Signal Description
10: Alternative Mode 2: see Chapter 3, Signal Description
11: Alternative Mode 3: see Chapter 3, Signal Description
Note: Number of bit depending of the number of actual alternate function. Please refer to
datasheet
Output Buffer Enable
This bit enables the output buffer of the pad when the pad is in GPIO mode.
1: Output Buffer of the pad is enabled when PA = 00.
0: Output Buffer of the pad is disabled when PA = 00.
Input Buffer Enable
This bit enables the input buffer of the pad.
1: Input Buffer of the pad is enabled.
0: Input Buffer of the pad is disabled.
43-12
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor