Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/LPC408x_7x/USB/I2C_TX#0x0
I2C Transmit
Transmit data.
When 1, issue a START condition before transmitting this byte.
When 1, issue a STOP condition after transmitting this byte.
Reserved. Read value is undefined, only zero should be written.
https://github.com/cmsis-svd/cmsis-svd-data