RM0440 Rev 4 1657/2126
RM0440 Universal synchronous/asynchronous receiver transmitter (USART/UART)
1733
Bits 31:29 TXFTCFG[2:0]: TXFIFO threshold configuration
000:TXFIFO reaches 1/8 of its depth
001:TXFIFO reaches 1/4 of its depth
010:TXFIFO reaches 1/2 of its depth
011:TXFIFO reaches 3/4 of its depth
100:TXFIFO reaches 7/8 of its depth
101:TXFIFO becomes empty
Remaining combinations: Reserved
Bit 28 RXFTIE: RXFIFO threshold interrupt enable
This bit is set and cleared by software.
0: Interrupt inhibited
1: USART interrupt generated when Receive FIFO reaches the threshold programmed in
RXFTCFG.
Bits 27:25 RXFTCFG[2:0]: Receive FIFO threshold configuration
000:Receive FIFO reaches 1/8 of its depth
001:Receive FIFO reaches 1/4 of its depth
010:Receive FIFO reaches 1/2 of its depth
011:Receive FIFO reaches 3/4 of its depth
100:Receive FIFO reaches 7/8 of its depth
101:Receive FIFO becomes full
Remaining combinations: Reserved
Bit 24 TCBGTIE: Transmission Complete before guard time, interrupt enable
This bit is set and cleared by software.
0: Interrupt inhibited
1: USART interrupt generated whenever TCBGT=1 in the USART_ISR register
Note: If the USART does not support the Smartcard mode, this bit is reserved and must be
kept at reset value. Refer to Section 37.4: USART implementation on page 1595.
Bit 23 TXFTIE: TXFIFO threshold interrupt enable
This bit is set and cleared by software.
0: Interrupt inhibited
1: USART interrupt generated when TXFIFO reaches the threshold programmed in
TXFTCFG.
Bit 22 WUFIE: Wakeup from low-power mode interrupt enable
This bit is set and cleared by software.
0: Interrupt inhibited
1: USART interrupt generated whenever WUF=1 in the USART_ISR register
Note: WUFIE must be set before entering in low-power mode.
If the USART does not support the wakeup from Stop feature, this bit is reserved and
must be kept at reset value. Refer to Section 37.4: USART implementation on
page 1595.
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