MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
21-35
21.4.9.2.9
BERR Description
While the eSCI is in LIN mode, the bit error (BERR) flag is set when one or more bits in the last
transmitted byte is not read back with the same value. The BERR flag is cleared by writing a 1 to the bit.
A bit error will cause the LIN FSM to reset. The BERR flag is cleared by writing a 1 to the bit.
21.4.9.2.10 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 which the receiver obtains by reading back the data which
the LIN finite state machine (FSM) has sent out. The RXRDY flag is cleared by writing a 1 to the bit.
21.4.9.2.11 TXRDY Description
While in LIN mode, the transmitter ready (TXRDY) flag is set when the eSCI can accept a control or data
byte. The TXRDY flag is cleared by writing a 1 to the bit.
21.4.9.2.12 LWAKE Description
The LIN wake-up (LWAKE) flag is set when the LIN hardware receives a wake-up character sent by one
of the LIN slaves. This occurs only when the LIN bus is in sleep mode. The LWAKE flag is cleared by
writing a 1 to the bit.
21.4.9.2.13 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. The STO flag is cleared by writing a 1 to the bit.
21.4.9.2.14 PBERR Description
If the RXD input remains stuck at a fixed value for 31 RT clock cycles after a transmission has started, the
LIN hardware sets the physical bus error (PBERR) flag. The PBERR flag is cleared by writing a 1 to the
bit.
21.4.9.2.15 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. The CERR flag is cleared by writing a 1 to the bit.
21.4.9.2.16 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. The CKERR flag is cleared by writing a 1 to the bit.
21.4.9.2.17 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. The FRC flag is cleared by writing a 1 to the bit.
NOTE
The last byte of a TX frame being sent or an RX frame being received
indicates that the checksum comparison has taken place.
Summary of Contents for MPC5553
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