View source for TM4C123GXL GPIO - Configure each pad in the port to have pull-up-pull-down-open drain

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== GPIO - Configure each pad in the port to have pull-up, pull-down, or open drain ==
Optionally, you can configure each pad in the port to have pull-up, pull-down, or open drain function through the GPIOPUR, GPIOPDR , or GPIOODR register. Slew rate may also be configured, if needed, through the '''GPIOSLR''' register.

=== GPIO Pull-Up Select (GPIOPUR), GPIO Pull-Down Select (GPIOPDR) ===
* The GPIOPUR register is the pull-up control register.
*: When a bit is set, a weak pull-up resistor on the corresponding GPIO signal is enabled.
*: Setting a bit in GPIOPUR automatically clears the corresponding bit in the GPIO Pull-Down Select (GPIOPDR) register.
* The GPIOPDR register is the pull-down control register.
*: When a bit is set, a weak pull-down resistor on the corresponding GPIO signal is enabled.
*: Setting a bit in GPIOPDR automatically clears the corresponding bit in the GPIO Pull-Up Select (GPIOPUR) register.

=== GPIO Pull-Up Select (GPIOPUR) Register ===
[[image:tm4c_gpiopur_r.png|center]]

=== GPIO Pull-Down Select (GPIOPDR) Register ===
[[image:tm4c_gpiopdr_r.png|center]]