Module RW
Source - RXIDEN_0
 - Disable RDRF assertion due to partially filled FIFO when receiver is idle.
 - RXIDEN_1
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 1 character.
 - RXIDEN_2
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 2 characters.
 - RXIDEN_3
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 4 characters.
 - RXIDEN_4
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 8 characters.
 - RXIDEN_5
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 16 characters.
 - RXIDEN_6
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 32 characters.
 - RXIDEN_7
 - Enable RDRF assertion due to partially filled FIFO when receiver is idle for 64 characters.