Information

UARTx_C6 field descriptions (continued)
Field Description
0 CEA709.1-B is disabled.
1 CEA709.1-B is enabled
6
TX709
CEA709.1-B Transmit Enable
Starts CEA709.1-B transmission.
0 CEA709.1-B transmitter is disabled.
1 CEA709.1-B transmitter is enabled.
5
CE
Collision Enable
Enables the collision detect functionality.
0 Collision detect feature is disabled.
1 Collision detect feature is enabled.
4
CP
Collision Signal Polarity
Indicates the polarity of the collision signal.
0 Collision signal is active low.
1 Collision signal is active high.
3–0
Reserved
This read-only field is reserved and always has the value zero.
45.3.33 UART CEA709.1-B Packet Cycle Time Counter High
(UARTx_PCTH)
Addresses: UART0_PCTH is 4006_A000h base + 22h offset = 4006_A022h
UART1_PCTH is 4006_B000h base + 22h offset = 4006_B022h
UART2_PCTH is 4006_C000h base + 22h offset = 4006_C022h
Bit 7 6 5 4 3 2 1 0
Read
PCTH
Write
Reset
0 0 0 0 0 0 0 0
UARTx_PCTH field descriptions
Field Description
7–0
PCTH
Packet Cycle Time Counter High
Indicates the most significant byte of maximum period after the line code violation for which the bus could
remain idle without decrementing back log count. If the time elapsed after line code violation is greater
than packet cycle time, then packet cycle timer expired interrupt is generated. It is measured in terms of
bit times, that is, the time it takes for a single bit or one differential Manchester symbol to be transmitted.
This is medium dependent and hence does not usually require adjustment and is programmed only once.
Chapter 45 Universal Asynchronous Receiver/Transmitter (UART)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 1087