Field
Function
16
RWRNINT
Rx Warning Interrupt Flag
If MCR[WRNEN] is asserted, RWRNINT is set when the RXWRN flag transitions from 0 to 1, meaning
that the Rx error counters reached 96. If the corresponding mask bit in the Control 1 Register
(CTRL1[RWRNMSK]) is set, an interrupt is generated to the CPU. This bit is cleared by writing it to 1.
When WRNEN is negated, this flag is masked. CPU must clear this flag before disabling the bit.
Otherwise it will be set when WRNEN is set again. Writing 0 has no effect. This bit is not updated during
Freeze mode.
When FlexCAN returns to Normal mode from Pretended Network mode (see
), this bit is updated to reflect the Rx error counter state.
0b - No such occurrence.
1b - The Rx error counter transitioned from less than 96 to greater than or equal to 96.
15
BIT1ERR
Bit1 Error
This bit indicates when an inconsistency occurs between the transmitted and the received bit in a non-
CAN FD message or in the arbitration or data phase of a CAN FD message.
This bit is updated when FlexCAN returns to Normal mode from Pretended Network mode.
NOTE: This bit is not set by a transmitter in case of arbitration field or ACK slot, or in case of a node
sending a passive error flag that detects dominant bits.
0b - No such occurrence.
1b - At least one bit sent as recessive is received as dominant.
14
BIT0ERR
Bit0 Error
This bit indicates when an inconsistency occurs between the transmitted and the received bit in a non-
CAN FD message or in the arbitration or data phase of a CAN FD message.
This bit is updated when FlexCAN returns to Normal mode from Pretended Network mode.
0b - No such occurrence.
1b - At least one bit sent as dominant is received as recessive.
13
ACKERR
Acknowledge Error
This bit indicates that an Acknowledge Error has been detected by the transmitter node, that is, a
dominant bit has not been detected during the ACK SLOT.
This bit is updated when FlexCAN returns to Normal mode from Pretended Network mode.
0b - No such occurrence.
1b - An ACK error occurred since last read of this register.
12
CRCERR
Cyclic Redundancy Check Error
This bit indicates that a CRC error has been detected by the receiver node either in a non-FD message or
in the arbitration or data phase of a frame in CAN FD format, that is, the calculated CRC is different from
the received.
This bit is updated when FlexCAN returns to Normal mode from Pretended Network mode.
0b - No such occurrence.
1b - A CRC error occurred since last read of this register.
11
FRMERR
Form Error
This bit indicates that a form error has been detected in a non-FD message or else in an FD message's
arbitration or data phase by the receiver node, that is, a fixed-form bit field contains at least one illegal bit.
This bit is updated when FlexCAN returns to Normal mode from Pretended Network mode.
0b - No such occurrence.
1b - A Form Error occurred since last read of this register.
10
Stuffing Error
Table continues on the next page...
Memory map/register definition
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