Weak pull-ups

nRF54LS05B Datasheet

A subset of the GPIO pins support weak pull-ups.

When enabled, the weak pull-ups are enabled for the complete set of GPIO pins connected to the weak pull-up module. Unlike GPIO, there is no per-pin configuration. Once enabled, the weak pull-up is applied to all GPIO pins that have weak pull-ups.

The set of pins that are connected to the weak pull-up module can be found in Pin assignments.

Figure 4. Block diagram
Page-1 Sheet.173 Rectangle Square.437 Sheet.19 GPIO pin GPIO pin Rectangle.443 GPIO.PORTCNF GPIO.PORTCNF Dynamic connector.123 Sheet.124 Sheet.119 Sheet.120 Dynamic connector.128 Sheet.129 Sheet.130 Sheet.131 Dynamic connector.134 Sheet.135 Sheet.136 Sheet.137 Sheet.144 Sheet.138 Sheet.139 Sheet.140 Sheet.141 Dynamic connector Sheet.146 PU0 PU0 Sheet.148 PU1 PU1 Sheet.149 PU2 PU2 Sheet.174

The pull-up is enabled on the full set of pins using PORTCNF.WEAKPU.

Note: Per-pin configurable pull-up and pull-down resistors are provided by GPIO — General purpose input/output. They operate independently of the weak pull-up.