52.3.17 UART FIFO Control Register (UARTx_CFIFO)
This register provides the ability to program various control bits for FIFO operation. This
register may be read or written at any time. Note that writing the TXFLUSH and
RXFLUSH bits may result in data loss and requires careful action to prevent unintended /
unpredictable behavior, hence it is recommended that TE and RE be cleared prior to
flushing the corresponding FIFO.
Addresses: UART0_CFIFO is 4006_A000h base + 11h offset = 4006_A011h
UART1_CFIFO is 4006_B000h base + 11h offset = 4006_B011h
UART2_CFIFO is 4006_C000h base + 11h offset = 4006_C011h
UART3_CFIFO is 4006_D000h base + 11h offset = 4006_D011h
UART4_CFIFO is 400E_A000h base + 11h offset = 400E_A011h
UART5_CFIFO is 400E_B000h base + 11h offset = 400E_B011h
Bit
7
6
5
4
3
2
1
0
Read
0
0
Write
Reset
0
0
0
0
0
0
0
0
UARTx_CFIFO field descriptions
Field
Description
7
TXFLUSH
Transmit FIFO/Buffer Flush
Writing to this bit causes all data that is stored in the transmit FIFO/buffer to be flushed. This does not
affect data that is in the transmit shift register.
0
No flush operation occurs.
1
All data in the transmit FIFO/Buffer is cleared out.
6
RXFLUSH
Receive FIFO/Buffer Flush
Writing to this bit causes all data that is stored in the receive FIFO/buffer to be flushed. This does not
affect data that is in the receive shift register.
0
No flush operation occurs.
1
All data in the receive FIFO/buffer is cleared out.
5–2
Reserved
This read-only field is reserved and always has the value zero.
1
TXOFE
Transmit FIFO Overflow Interrupt Enable
When this bit is set the TXOF flag will generate an interrupt to the host.
0
TXOF flag does not generate an interrupt to the host.
1
TXOF flag generates an interrupt to the host.
0
RXUFE
Receive FIFO Underflow Interrupt Enable
When this bit is set the RXUF flag will generate an interrupt to the host.
Table continues on the next page...
Chapter 52 Universal Asynchronous Receiver/Transmitter (UART)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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