Information

PORTx_PCRn field descriptions (continued)
Field Description
7
Reserved
This read-only field is reserved and always has the value zero.
6
DSE
Drive Strength Enable
Drive strength configuration is valid in all digital pin muxing modes.
0 Low drive strength is configured on the corresponding pin, if pin is configured as a digital output.
1 High drive strength is configured on the corresponding pin, if pin is configured as a digital output.
5
ODE
Open Drain Enable
Open drain configuration is valid in all digital pin muxing modes.
0 Open drain output is disabled on the corresponding pin.
1 Open drain output is enabled on the corresponding pin, if the pin is configured as a digital output.
4
PFE
Passive Filter Enable
Passive filter configuration is valid in all digital pin muxing modes.
0 Passive input filter is disabled on the corresponding pin.
1 Passive input filter is enabled on the corresponding pin, if the pin is configured as a digital input. A low
pass filter of 10 MHz to 30 MHz bandwidth is enabled on the digital input path. Disable the passive
input filter when high speed interfaces of more than 2 MHz are supported on the pin.
3
Reserved
This read-only field is reserved and always has the value zero.
2
SRE
Slew Rate Enable
Slew rate configuration is valid in all digital pin muxing modes.
0 Fast slew rate is configured on the corresponding pin, if the pin is configured as a digital output.
1 Slow slew rate is configured on the corresponding pin, if the pin is configured as a digital output.
1
PE
Pull Enable
Pull configuration is valid in all digital pin muxing modes.
0 Internal pullup or pulldown resistor is not enabled on the corresponding pin.
1 Internal pullup or pulldown resistor is enabled on the corresponding pin, if the pin is configured as a
digital input.
0
PS
Pull Select
Pull configuration is valid in all digital pin muxing modes.
0 Internal pulldown resistor is enabled on the corresponding pin, if the corresponding Port Pull Enable
field is set.
1 Internal pullup resistor is enabled on the corresponding pin, if the corresponding Port Pull Enable field
is set.
Chapter 11 Port control and interrupts (PORT)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 215