The configuration of each Pin Control register is retained when the PORT module isdisabled.Whenever a pin is configured in any digital pin muxing mode, the input buffer for thatpin is enabled allowing the pin state to be read via the corresponding GPIO Port DataInput Register (GPIO_PDIR) or allowing a pin interrupt or DMA request to be generated.If a pin is ever floating when its input buffer is enabled, then this can cause an increase inpower consumption and must be avoided. A pin can be floating due to an input pin that isnot connected or an output pin that has tri-stated (output buffer is disabled).Enabling the internal pull resistor (or implementing an external pull resistor) will ensure apin does not float when its input buffer is enabled; note that the internal pull resistor isautomatically disabled whenever the output buffer is enabled allowing the Pull Enable bitto remain set. Configuring the Pin Muxing mode to disabled or analog will disable thepin’s input buffer and results in the lowest power consumption.10.7.2 Global pin controlThe two global pin control registers allow a single register write to update the lower halfof the pin control register on up to 16 pins, all with the same value. Registers that arelocked cannot be written using the global pin control registers.The global pin control registers are designed to enable software to quickly configuremultiple pins within the one port for the same peripheral function. However, the interruptfunctions cannot be configured using the global pin control registers.The global pin control registers are write-only registers, that always read as 0.10.7.3 Global interrupt controlThe two global interrupt control registers allow a single register write to update the upperhalf of the pin control register on up to 16 pins, all with the same value.The global interrupt control registers are designed to enable software to quickly configuremultiple pins within the one port for the same interrupt configuration. However, the pincontrol functions cannot be configured using the global interrupt control registers.The global interrupt control registers are write-only registers and always read as 0.Functional descriptionMWCT101xS Series Reference Manual, Rev. 3, 07/2019180 NXP Semiconductors
