Motorola ColdFire MCF5281 - Manual (Page 496)

FlexCAN
25-26 Freescale Semiconductor
Table 25-17 describes the ESTAT fields.
15 14 13 12 11 10 9 8
Field BITERR ACKERR CRCERR FORMERR STUFFERR TXWARN RXWARN
Reset 0000_0000
R/W R
7 6 5 4 3 2 1 0
Field IDLE TX/RX FCS — BOFFINT ERRINT WAKEINT
Reset 0000_0000
R/W R R/W
Address IPSBAR + 0x1C_0020
Figure 25-13. FlexCAN Error and Status Register (ESTAT)
Table 25-17. ESTAT Field Descriptions
Bits Name Description
15–14 BITERR Transmit bit error. The BITERR[1:0] field is used to indicate when a transmit bit error occurs.
00 No transmit bit error
01 At least one bit sent as dominant was received as recessive
10 At least one bit sent as recessive was received as dominant
11 Reserved
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.
13 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.
12 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.
11 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.
10 STUFERR 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.
9 TXWARN Transmit error status flag. The TXWARN status flag reflects the status of the FlexCAN
transmit error counter.
0 Transmit error counter
<
96.
1 Transmit error counter
≥
96.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3