Datasheet

Bits Name Description Type Reset
6:5 WLEN Word length. These bits indicate the number of data bits
transmitted or received in a frame as follows: b11 = 8 bits
b10 = 7 bits b01 = 6 bits b00 = 5 bits.
RW 0x0
4 FEN Enable FIFOs: 0 = FIFOs are disabled (character mode) that
is, the FIFOs become 1-byte-deep holding registers 1 =
transmit and receive FIFO buffers are enabled (FIFO mode).
RW 0x0
3 STP2 Two stop bits select. If this bit is set to 1, two stop bits are
transmitted at the end of the frame. The receive logic does
not check for two stop bits being received.
RW 0x0
2 EPS Even parity select. Controls the type of parity the UART
uses during transmission and reception: 0 = odd parity. The
UART generates or checks for an odd number of 1s in the
data and parity bits. 1 = even parity. The UART generates or
checks for an even number of 1s in the data and parity bits.
This bit has no effect when the PEN bit disables parity
checking and generation.
RW 0x0
1 PEN Parity enable: 0 = parity is disabled and no parity bit added
to the data frame 1 = parity checking and generation is
enabled.
RW 0x0
0 BRK Send break. If this bit is set to 1, a low-level is continually
output on the UARTTXD output, after completing
transmission of the current character. For the proper
execution of the break command, the software must set
this bit for at least two complete frames. For normal use,
this bit must be cleared to 0.
RW 0x0
UARTCR Register
Description
Control Register, UARTCR
Table 461. UARTCR
Register
Bits Name Description Type Reset
31:16 Reserved. - - -
15 CTSEN CTS hardware flow control enable. If this bit is set to 1, CTS
hardware flow control is enabled. Data is only transmitted
when the nUARTCTS signal is asserted.
RW 0x0
14 RTSEN RTS hardware flow control enable. If this bit is set to 1, RTS
hardware flow control is enabled. Data is only requested
when there is space in the receive FIFO for it to be received.
RW 0x0
13 OUT2 This bit is the complement of the UART Out2 (nUARTOut2)
modem status output. That is, when the bit is programmed
to a 1, the output is 0. For DTE this can be used as Ring
Indicator (RI).
RW 0x0
12 OUT1 This bit is the complement of the UART Out1 (nUARTOut1)
modem status output. That is, when the bit is programmed
to a 1 the output is 0. For DTE this can be used as Data
Carrier Detect (DCD).
RW 0x0
RP2040 Datasheet
4.3. UART 455