Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/LPC800/GPIO_PORT/PIN0#0x0
Port pin register port 0
Reads pin states or loads output bits (bit 0 = P0_0, bit 1 = P0_1, …, bit 17 = P0_17). 0 = Read: pin is low; write: clear output bit. 1 = Read: pin is high; write: set output bit.
Reserved.
https://github.com/cmsis-svd/cmsis-svd-data