Datasheet

SCIx_S2 field descriptions (continued)
Field Description
0 No LIN break character has been detected.
1 LIN break character has been detected.
6
RXEDGIF
RxD Pin Active Edge Interrupt Flag
RXEDGIF is set when an active edge, falling if RXINV = 0, rising if RXINV=1, on the RxD pin occurs.
RXEDGIF is cleared by writing a 1 to it.
0 No active edge on the receive pin has occurred.
1 An active edge on the receive pin has occurred.
5
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
4
RXINV
Receive Data Inversion
Setting this bit reverses the polarity of the received data input.
NOTE: Setting RXINV inverts the RxD input for all cases: data bits, start and stop bits, break, and idle.
0 Receive data not inverted.
1 Receive data inverted.
3
RWUID
Receive Wake Up Idle Detect
RWUID controls whether the idle character that wakes up the receiver sets the IDLE bit.
0 During receive standby state (RWU = 1), the IDLE bit does not get set upon detection of an idle
character.
1 During receive standby state (RWU = 1), the IDLE bit gets set upon detection of an idle character.
2
BRK13
Break Character Generation Length
BRK13 selects a longer transmitted break character length. Detection of a framing error is not affected by
the state of this bit.
0 Break character is transmitted with length of 10 bit times (if M = 0, SBNS = 0) or 11 (if M = 1, SBNS =
0 or M = 0, SBNS = 1) or 12 (if M = 1, SBNS = 1).
1 Break character is transmitted with length of 13 bit times (if M = 0, SBNS = 0) or 14 (if M = 1, SBNS =
0 or M = 0, SBNS = 1) or 15 (if M = 1, SBNS = 1).
1
LBKDE
LIN Break Detection Enable
LBKDE selects a longer break character detection length. While LBKDE is set, framing error (FE) and
receive data register full (RDRF) flags are prevented from setting.
0 Break character is detected at length 10 bit times (if M = 0, SBNS = 0) or 11 (if M = 1, SBNS = 0 or M
= 0, SBNS = 1) or 12 (if M = 1, SBNS = 1).
1 Break character is detected at length of 11 bit times (if M = 0, SBNS = 0) or 12 (if M = 1, SBNS = 0 or
M = 0, SBNS = 1) or 13 (if M = 1, SBNS = 1).
0
RAF
Receiver Active Flag
RAF is set when the SCI receiver detects the beginning of a valid start bit, and RAF is cleared
automatically when the receiver detects an idle line. This status flag can be used to check whether an SCI
character is being received before instructing the MCU to go to stop mode.
0 SCI receiver idle waiting for a start bit.
1 SCI receiver active (RxD input not idle).
Chapter 15 Serial communications interface (SCI)
MC9S08PA60 Reference Manual, Rev. 1, 9/2012
Freescale Semiconductor, Inc. 413