Texas Instruments AM335 Series Technical Reference Manual

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19.5.1.21 Status FIFO Line Status Register (SFLSR)
Reading the status FIFO line status register (SFLSR) effectively reads frame status information from the
status FIFO. This register does not physically exist. Reading this register increments the status FIFO read
pointer (SFREGL and SFREGH must be read first). The status FIFO line status register (SFLSR) is shown
in Figure 19-54 and described in Table 19-52.
NOTE: Top of RX FIFO = Next frame to be read from RX FIFO.
Figure 19-54. Status FIFO Line Status Register (SFLSR)
15 8
Reserved
R-0
7 5 4 3 2 1 0
Reserved OE_ERROR FRAME_TOO_LONG_ERROR ABORT_DETECT CRC_ERROR Reserved
R-0 R-unknown R-unknown R-unknown R-unknown R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-52. Status FIFO Line Status Register (SFLSR) Field Descriptions
Bit Field Value Description
15-5 Reserved 0 Reserved.
4 OE_ERROR 0 No error
1 Overrun error in RX FIFO when frame at top of RX FIFO was received.
3 FRAME_TOO_LONG_ERROR 0 No error
1 Frame-length too long error in frame at top of RX FIFO.
2 ABORT_DETECT 0 No error
1 Abort pattern detected in frame at top of RX FIFO.
1 CRC_ERROR 0 No error
1 CRC error in frame at top of RX FIFO.
0 Reserved 0 Reserved.
19.5.1.22 RESUME Register
The RESUME register is used to clear internal flags, which halt transmission/reception when an
underrun/overrun error occurs. Reading this register resumes the halted operation. This register does not
physically exist and always reads as 00. The RESUME register is shown in Figure 19-55 and described in
Table 19-53.
Figure 19-55. RESUME Register
15 8 7 0
Reserved RESUME
R-0 R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 19-53. RESUME Register Field Descriptions
Bit Field Value Description
15-8 Reserved 0 Reserved.
7-0 RESUME 0-FFh Dummy read to restart the TX or RX.
3525
SPRUH73H–October 2011–Revised April 2013 Universal Asynchronous Receiver/Transmitter (UART)
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Texas Instruments AM335 Series Specifications

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Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English