Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/LPC800/MRT/IDLE_CH#0x0
Idle channel register. This register returns the number of the first idle channel.
Reserved.
Idle channel. Reading the CHAN bits, returns the lowest idle timer channel. If all timer channels are running, CHAN = .
https://github.com/cmsis-svd/cmsis-svd-data