Enhanced Serial Communication Interface (eSCI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
24-33
Preliminary
24.4.8.2.10
RXRDY Description
While in LIN mode, the receiver ready (RXRDY) flag is set when the eSCI receives a valid data byte in
an RX frame. RXRDY will not be set for bytes that the receiver obtains by reading back the data which
the LIN finite state machine (FSM) has sent out. Writing a 1 to the bit clears the RXRDY flag.
24.4.8.2.11
TXRDY Description
While in LIN mode, the transmitter ready (TXRDY) flag is set when the eSCI can accept a control or data
byte. Writing a 1 to the bit clears the TXRDY flag.
24.4.8.2.12
LWAKE Description
The LIN wakeup (LWAKE) flag is set when the LIN hardware receives a wakeup character sent by one of
the LIN slaves. This occurs only when the LIN bus is in sleep mode. Writing a 1 to the bit clears the
LWAKE flag.
24.4.8.2.13
STO Description
The slave timeout (STO) flag is set during an RX frame when the LIN slave has not transmitted all
requested data bytes before the specified timeout period. Writing a 1 to the bit clears the STO flag.
24.4.8.2.14
PBERR Description
If the RXD input remains stuck at a fixed value for 15 cycles after a transmission has started, the LIN
hardware sets the physical bus error (PBERR) flag. Writing a 1 to the bit clears the PBERR flag.
24.4.8.2.15
CERR Description
If an RX frame has the CRC checking flag set and the two CRC bytes do not match the calculated CRC
pattern, the CRC error (CERR) flag is set. Writing a 1 to the bit clears the CERR flag.
24.4.8.2.16
CKERR Description
If an RX frame has the checksum checking flag set and the last byte does not match the calculated
checksum, the checksum error (CKERR) flag is set. Writing a 1 to the bit clears the CKERR flag.
24.4.8.2.17
FRC Description
The frame complete (FRC) flag is set after the last byte of a TX frame is sent out, or after the last byte of
an RX frame is received. Writing a 1 to the bit clears the FRC flag.
NOTE
The last byte of a TX frame being sent or an RX frame being received
indicates that the checksum comparison has taken place.