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Chapter 32 USART (LIN / FIFO)
4.USART Registers
(Note) The RX triggerlevel sets the reception FIFO level where the reception interrupt is activated. E.g. if
the triggerlevel is at its default value of RXL[3:0]=0000, the interrupt is activated if one reception is
stored in the FIFO. If the the triggerlevel is set to RXL[3:0]=1111, the interrupt is activated if 16
receptions are stored in the FIFO. In general: a reception interrupt is triggered if FSR[4:0] >
FCR[3:0].
Table 4-9 Functions of each bit of fifo control register (FCR4)
Bit name Function
bit 0 SVD: select Valid
Data Fifo read
• If this bit is set to 0 the fifo status register shows the number of valid data
from the RX fifo
• If this bit is set to 1 the fifo status register shows the number of valid data
from the TX fifo
bit 1 ETX: enable TX
fifo
• If this bit is set to 0 the TX fifo is disabled / fifo data is cleared
• If this bit is set to 1 the TX fifo is enabled.
bit 2 ERX: enable RX
fifo
• If this bit is set to 0 the RX fifo is disabled / fifo data is cleared
• If this bit is set to 1 the RX fifo is enabled.
bit 3 reserved
bit 4 RXL0: RX
Triggerlevel bit 0
• Set the triggerlevel of RX Interrupt
bit 5 RXL1: RX
Triggerlevel bit 1
• Set the triggerlevel of RX Interrupt
bit 6 RXL2: RX
Triggerlevel bit 2
• Set the triggerlevel of RX Interrupt
bit 7 RXL3: RX
Triggerlevel bit 3
• Set the triggerlevel of RX Interrupt