Information

UARTx_S2 field descriptions
Field Description
7
LBKDIF
LIN Break Detect Interrupt Flag
LBKDIF is set when LBKDE is set and a LIN break character is detected on the receiver input. The LIN
break characters are 11 consecutive logic 0s if C1[M] = 0 or 12 consecutive logic 0s if C1[M] = 1. LBKDIF
is set after receiving the last LIN break character. LBKDIF is cleared by writing a 1 to it.
0 No LIN break character detected.
1 LIN break character detected.
6
RXEDGIF
RxD Pin Active Edge Interrupt Flag
RXEDGIF is set when an active edge occurs on the RxD pin. The active edge is falling if RXINV = 0, and
rising if RXINV=1. RXEDGIF is cleared by writing a 1 to it. See for additional details. RXEDGIF description
NOTE: The active edge is detected only in two wire mode and on receiving data coming from the RxD
pin.
0 No active edge on the receive pin has occurred.
1 An active edge on the receive pin has occurred.
5
MSBF
Most Significant Bit First
Setting this field reverses the order of the bits that are transmitted and received on the wire. This field
does not affect the polarity of the bits, the location of the parity bit, or the location of the start or stop bits.
This field is automatically set when C7816[INIT] and C7816[ISO7816E] are enabled and an initial
character is detected in T = 0 protocol mode.In EN709 mode, this field affects the order of bits the same
way as it does in normal mode.
0 LSB (bit0) is the first bit that is transmitted following the start bit. Further, the first bit received after the
start bit is identified as bit0.
1 MSB (bit8, bit7 or bit6) is the first bit that is transmitted following the start bit, depending on the setting
of C1[M] and C1[PE]. Further, the first bit received after the start bit is identified as bit8, bit7, or bit6,
depending on the setting of C1[M] and C1[PE].
4
RXINV
Receive Data Inversion
Setting this field reverses the polarity of the received data input. In NRZ format, a one is represented by a
mark and a zero is represented by a space for normal polarity, and the opposite for inverted polarity. In
IrDA format, a zero is represented by short high pulse in the middle of a bit time remaining idle low for a
one for normal polarity. A zero is represented by a short low pulse in the middle of a bit time remaining
idle high for a one for inverted polarity.This field is automatically set when C7816[INIT] and
C7816[ISO7816E] are enabled and an initial character is detected in T = 0 protocol mode.In EN709
mode, this bit affects the polarity of bits the same as it does in normal mode.
NOTE: Setting RXINV inverts the RxD input for data bits, start and stop bits, break, and idle. When
C7816[ISO7816E] is set/enabled, only the data bits and the parity bit are inverted.
0 Receive data is not inverted.
1 Receive data is inverted.
3
RWUID
Receive Wakeup Idle Detect
When RWU is set and WAKE is cleared, this field controls whether the idle character that wakes the
receiver sets S1[IDLE]. This field must be cleared when C7816[ISO7816E] is set/enabled.
0 S1[IDLE] is not set upon detection of an idle character.
1 S1[IDLE] is set upon detection of an idle character.
Table continues on the next page...
Memory map and registers
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
1062 Freescale Semiconductor, Inc.