Motorola MPC533 Reference Manual page 722

Programmer's Model
Bits Name
0:1 BITERR Transmit bit error. The BITERR[1:0] field is used to indicate when a transmit bit error occurs.
Refer to Table 16-24.
NOTE: The transmit bit error field is not modified during the arbitration field or the ACK slot
bit time of a message, or by a transmitter that detects dominant bits while sending a passive
error frame.
2 ACKERR Acknowledge error. The ACKERR bit indicates whether an acknowledgment has been
correctly received for a transmitted message.
0 No ACK error was detected since the last read of this register
1 An ACK error was detected since the last read of this register
3 CRCERR Cyclic redundancy check error. The CRCERR bit indicates whether or not the CRC of the last
transmitted or received message was valid.
0 No CRC error was detected since the last read of this register
1 A CRC error was detected since the last read of this register
4 FORMERR Message format error. The FORMERR bit indicates whether or not the message format of
the last transmitted or received message was correct.
0 No format error was detected since the last read of this register
1 A format error was detected since the last read of this register
5 STUFFERR Bit stuff error. The STUFFERR bit indicates whether or not the bit stuffing that occurred in the
last transmitted or received message was correct.
0 No bit stuffing error was detected since the last read of this register
1 A bit stuffing error was detected since the last read of this register
6 TXWARN Transmit error status flag. The TXWARN status flag reflects the status of the TouCAN
transmit error counter.
0 Transmit error counter < 96
1 Transmit error counter ≥ 96
7 RXWARN Receiver error status flag. The RXWARN status flag reflects the status of the TouCAN receive
error counter.
0 Receive error counter < 96
1 Receive error counter ≥ 96
8 IDLE Idle status. The IDLE bit indicates when there is activity on the CAN bus.
0 The CAN bus is not idle
1 The CAN bus is idle
9 TX/RX Transmit/receive status. The TX/RX bit indicates when the TouCAN module is transmitting or
receiving a message. TX/RX has no meaning when IDLE = 1.
0 The TouCAN is receiving a message if IDLE = 0
1 The TouCAN is transmitting a message if IDLE = 0
10:11 FCS Fault confinement state. The FCS[1:0] field describes the state of the TouCAN. Refer to
Table 16-25.
If the SOFTRST bit in CANMCR is asserted while the TouCAN is in the bus off state, the error
and status register is reset, including FCS[1:0]. However, as soon as the TouCAN exits reset,
FCS[1:0] bits will again reflect the bus off state. Refer to Section 16.3.4, "Error Counters" for
more information on entry into and exit from the various fault confinement states.
12 — Reserved
16-36
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Table 16-23. ESTAT Bit Descriptions
MPC533 Reference Manual
Description
MOTOROLA