UARTx_PFIFO field descriptions
Field
Description
7
TXFE
Transmit FIFO Enable
When this bit is set the built in FIFO structure for the transmit buffer is enabled. The size of the FIFO
structure is indicated by the TXFIFOSIZE field. If this bit is not set then the transmit buffer operates as a
FIFO of depth one dataword regardless of the value in TXFIFOSIZE. Both C2[TE] and C2[RE] must be
cleared prior to changing this bit. Additionally TXFLUSH and RXFLUSH commands should be issued
immediately after changing this bit.
0
Transmit FIFO is not enabled. Buffer is depth 1. (Legacy support).
1
Transmit FIFO is enabled. Buffer is depth indicted by TXFIFOSIZE.
6–4
TXFIFOSIZE
Transmit FIFO. Buffer Depth
The maximum number of transmit datawords that can be stored in the transmit buffer. This field is read
only.
000
Transmit FIFO/Buffer Depth = 1 Dataword.
001
Transmit FIFO/Buffer Depth = 4 Datawords.
010
Transmit FIFO/Buffer Depth = 8 Datawords.
011
Transmit FIFO/Buffer Depth = 16 Datawords.
100
Transmit FIFO/Buffer Depth = 32 Datawords.
101
Transmit FIFO/Buffer Depth = 64 Datawords.
110
Transmit FIFO/Buffer Depth = 128 Datawords.
111
Reserved.
3
RXFE
Receive FIFO Enable
When this bit is set the built in FIFO structure for the receive buffer is enabled. The size of the FIFO
structure is indicated by the RXFIFOSIZE field. If this bit is not set then the receive buffer operates as a
FIFO of depth one dataword regardless of the value in RXFIFOSIZE. Both C2[TE] and C2[RE] must be
cleared prior to changing this bit. Additionally TXFLUSH and RXFLUSH commands should be issued
immediately after changing this bit.
0
Receive FIFO is not enabled. Buffer is depth 1. (Legacy support)
1
Receive FIFO is enabled. Buffer is depth indicted by RXFIFOSIZE.
2–0
RXFIFOSIZE
Receive FIFO. Buffer Depth
The maximum number of receive datawords that can be stored in the receive buffer before an overrun
occurs. This field is read only.
000
Receive FIFO/Buffer Depth = 1 Dataword.
001
Receive FIFO/Buffer Depth = 4 Datawords.
010
Receive FIFO/Buffer Depth = 8 Datawords.
011
Receive FIFO/Buffer Depth = 16 Datawords.
100
Receive FIFO/Buffer Depth = 32 Datawords.
101
Receive FIFO/Buffer Depth = 64 Datawords.
110
Receive FIFO/Buffer Depth = 128 Datawords.
111
Reserved.
Memory map and registers
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1456
Freescale Semiconductor, Inc.
Содержание K53 Series
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