Information

UARTx_S3 field descriptions (continued)
Field Description
2
PCTEF
Packet Cycle Timer Expired Flag
Indicates that packet cycle time period has expired with no activity on the line. This flag is cleared by
writing 1.
0 Packet cycle time has not expired.
1 Packet cycle time has expired.
1
PSF
Preamble Start Flag
Indicates start of the preamble while the packet is being transmitted. This flag is cleared by writing 1.
0 Preamble start is not detected.
1 Preamble start is detected.
0
TXFF
Transmission Fail Flag
Indicates that transmission could not proceed. This flag is asserted when the packet is queued for
transmission but before the random delay has expired and an incoming receive packet is detected. This
flag is also asserted while transmission when the TX FIFO becomes empty or overflows. In these cases,
line code violation is transmitted on TX line immediately after the current byte or preamble transmission is
finished, without waiting for completion of transmit packet length. If the transmission fail flag is asserted,
C6[TX709] is cleared. This flag is cleared by writing 1.
0 Transmission continues normally.
1 Transmission has failed.
48.3.43 UART CEA709.1-B Status Register (UARTx_S4)
Address: Base address + 2Ch offset
Bit 7 6 5 4 3 2 1 0
Read 0 INITF
CDET ILCV FE
Write
Reset
0 0 0 0 0 0 0 0
UARTx_S4 field descriptions
Field Description
7–5
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
4
INITF
Initial Synchronization Fail Flag
Indicates that the initial synchronization has failed and the packet cycle time has expired after enabling
EN709 register. This flag is cleared if EN709 is cleared.
0 Initial synchronization has not failed.
1 Initial synchronization has failed.
3–2
CDET
CDET
Table continues on the next page...
Chapter 48 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
1317
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