What is the value of the GPIO Pull-up and Pull-down resistor?
The values can be found in the nRF51822/nRF51422 Product Specification. Please see Section 8.23.
Symbol | Parameter | Min. | Typ. | Max. | Units RPU | Pull-up resistance | 11 | 13 | 16 | kOhm RPD | Pull-down resistance | 11 | 13 | 16 | kOhm