When using timer RF, I cannot write a value to compare 1 register (TRFM1). Why?
Values cannot be written to compare 1 register (TRFM1) while the TMOD bit of the TRFCR1 register is 0 (input capture mode). Set the TMOD bit of the TRFCR1 register to 1 (output compare mode) before writing a value to TRFM1. Please note that when the TMOD bit is set to 1, the value of the TRFM1 register will automatically be set to FFFFh.