Espressif ESP32 Technical Reference Manual page 368

13 UART Controller (UART)
31 28 27 26 25
0 0 0 0 1 0 0
UART_TICK_REF_ALWAYS_ON This register is used to select the clock; 1: APB clock; 0: REF_TICK.
(R/W)
UART_DTR_INV Set this bit to invert the level of the UART DTR signal. (R/W)
UART_RTS_INV Set this bit to invert the level of the UART RTS signal. (R/W)
UART_TXD_INV Set this bit to invert the level of the UART TxD signal. (R/W)
UART_DSR_INV Set this bit to invert the level of the UART DSR signal. (R/W)
UART_CTS_INV Set this bit to invert the level of the UART CTS signal. (R/W)
UART_RXD_INV Set this bit to invert the level of the UART Rxd signal. (R/W)
UART_TXFIFO_RST Set this bit to reset the UART transmit-FIFO. NOTICE: UART2 doesn't have any
register to reset Tx_FIFO or Rx_FIFO, and the UART1_TXFIFO_RST and UART1_RXFIFO_RST in
UART1 may impact the functioning of UART2. Therefore, these two registers in UART1 should
only be used when the Tx_FIFO and Rx_FIFO in UART2 do not have any data. (R/W)
UART_RXFIFO_RST Set this bit to reset the UART receive-FIFO. NOTICE: UART2 doesn't have any
register to reset Tx_FIFO or Rx_FIFO, and the UART1_TXFIFO_RST and UART1_RXFIFO_RST in
UART1 may impact the functioning of UART2. Therefore, these two registers in UART1 should
only be used when the Tx_FIFO and Rx_FIFO in UART2 do not have any data. (R/W)
UART_IRDA_EN Set this bit to enable the IrDA protocol. (R/W)
UART_TX_FLOW_EN Set this bit to enable the flow control function for the transmitter. (R/W)
UART_LOOPBACK Set this bit to enable the UART loopback test mode. (R/W)
UART_IRDA_RX_INV Set this bit to invert the level of the IrDA receiver. (R/W)
UART_IRDA_TX_INV Set this bit to invert the level of the IrDA transmitter. (R/W)
UART_IRDA_WCTL 1: The IrDA transmitter's 11th bit is the same as its 10th bit; 0: set IrDA transmitter's
11th bit to 0. (R/W)
UART_IRDA_TX_EN This is the start enable bit of the IrDA transmitter. (R/W)
UART_IRDA_DPLX Set this bit to enable the IrDA loopback mode. (R/W)
UART_TXD_BRK Set this bit to enable the transmitter to send NULL, when the process of sending
data is completed. (R/W)
Continued on the next page...
Espressif Systems
Register 13.9. UART_CONF0_REG (0x20)
24 23 22 21 20 19 18 17
0 0 0 0 0 0 0 0
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16 15 14 13 12 11 10 9
0 0 0 0 0 0 0 0
368
8 7 6 5 4 3 2 1
0 0 0 1 3 0
ESP32 TRM (Version 5.2)
0
0 Reset