pub type FRXTH_W<'a, const O: u8> = BitWriter<'a, u32, CR2_SPEC, FRXTH_A, O>;
Field FRXTH writer - FIFO reception threshold
FRXTH
RXNE event is generated if the FIFO level is greater than or equal to 1/2 (16-bit)
RXNE event is generated if the FIFO level is greater than or equal to 1/4 (8-bit)