PXR40RM Datasheet, PDF (208/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

System Integration Unit (SIU)
Field
12–13
SRC[
14
WPE
15
WPS
Table 7-20. SIU_PCR Bit Field Descriptions (continued)
Description
Slew rate control. Controls slew rate for the pad. Slew rate control pertains to pins with slow or medium
I/O pad types, and the output signals are driven according to the value of this field. Actual slew rate
depends on the pad type and load. Refer to the electrical specifications for this information.
00 Minimum slew rate
01 Medium slew rate
10 Invalid value
11 Maximum slew rate
Weak pullup/down enable. Controls whether the weak pullup/down devices are enabled/disabled for the
pad. Pullup/down devices are enabled by default.
0 Disable weak pull device for the pad.
1 Enable weak pull device for the pad.
Weak pullup/down select. Controls whether weak pullup or weak pulldown devices are used for the pad
when weak pullup/down devices are enabled. The WKPCFG pin determines whether pullup or pulldown
devices are enabled during reset. The WPS bit determines whether weak pullup or pulldown devices are
used after reset, or for pads in which the WKPCFG pin does not determine the reset weak pullup/down
state.
0 Pulldown is enabled for the pad.
1 Pullup is enabled for the pad.
7-26
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor