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Difference between revisions of "TM4C123GXL GPIO - Configure each pad in the port to have pull-up-pull-down-open drain"

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*: When a bit is set, a weak pull-down resistor on the corresponding GPIO signal is enabled.
 
*: 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.
 
*: Setting a bit in GPIOPDR automatically clears the corresponding bit in the GPIO Pull-Up Select (GPIOPUR) register.
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=== GPIO Pull-Up Select (GPIOPUR) Register ===
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[[image:tm4c_gpiopur_r.png|center]]
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=== GPIO Pull-Down Select (GPIOPDR) Register ===
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[[image:tm4c_gpiopdr_r.png|center]]

Revision as of 06:28, 3 June 2019

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

Tm4c gpiopur r.png

GPIO Pull-Down Select (GPIOPDR) Register

Tm4c gpiopdr r.png