Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/LPC11D14/SYSCON/WDTCLKSEL#0x0
SEL=IRC_OSCILLATOR
WDT clock source select
WDT clock source
0 (IRC_OSCILLATOR): IRC oscillator
1 (MAIN_CLOCK): Main clock
2 (WATCHDOG_OSCILLATOR): Watchdog oscillator
3 (RESERVED): Reserved
Reserved
https://github.com/cmsis-svd/cmsis-svd-data