LM3S8971 Luminary Micro, Inc, LM3S8971 Datasheet - Page 397

• Manufacturer Part Number: LM3S8971
• Description: Lm3s8971 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

July 26, 2008
Bit/Field
2:0
Name
LEC
Type
R/W
Reset
0x0
Preliminary
Description
Last Error Code
This is the type of the last error to occur on the CAN bus.
Value
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Definition
No Error
Stuff Error
More than 5 equal bits in a sequence have occurred in a part
of a received message where this is not allowed.
Format Error
A fixed format part of the received frame has the wrong format.
ACK Error
The message transmitted was not acknowledged by another
node.
Bit 1 Error
When a message is transmitted, the CAN controller monitors
the data lines to detect any conflicts. When the arbitration field
is transmitted, data conflicts are a part of the arbitration protocol.
When other frame fields are transmitted, data conflicts are
considered errors.
A Bit 1 Error indicates that the device wanted to send a High
level (logical 1) but the monitored bus value was Low (logical
0).
Bit 0 Error
A Bit 0 Error indicates that the device wanted to send a Low
level (logical 0), but the monitored bus value was High (logical
1).
During bus-off recovery, this status is set each time a sequence
of 11 High bits has been monitored. This enables the CPU to
monitor the proceeding of the bus-off recovery sequence without
any disturbances to the bus.
CRC Error
The CRC checksum was incorrect in the received message,
indicating that the calculated value received did not match the
calculated CRC of the data.
Unused
When the LEC bit shows this value, no CAN bus event was
detected since the CPU wrote this value to LEC.
LM3S8971 Microcontroller
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