NEC UPD703116 User Manual page 584

(22) CAN1 information register (C1LAST)
The C1LAST register indicates the CAN module's error information and the number of the message buffer
received last.
This register is read-only, in 16-bit units.
15 14 13
C1LAST 0 0 0
Bit position Bit name
11 to 8 LERR3 to
LERR0
7 to 0 LREC7 to
LREC0
Note xxxx: CAN message buffer registers can be allocated to the xxxx addresses as programmable
peripheral I/O registers. Note, however, that the xxxx addresses cannot be changed after being
set.
m = 2, 6, A, E
584
CHAPTER 11 FCAN CONTROLLER
12 11 10 9 8 7
0 LERR3 LERR2 LERR1 LERR0 LREC7
Indicates the last error information.
LERR3 LERR2
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
1 0
Other than above
Caution Since the LERR3 to LERR0 bits cannot be cleared, the current status is
retained until the next error occurs.
Indicates the last received message number.
0 to 31: The number of the message buffer last received
32 to 255: Not used
User's Manual U14492EJ5V0UD
6 5 4 3 2 1
LREC6 LREC5 LREC4 LREC3 LREC2 LREC1
Function
LERR1 LERR0
0 0 Error not detected
0 1 Bit error
1 0 Stuff error
1 1 CRC error
0 0 Form error
0 1 ACK error
1 0 Arbitration lost (only in single shot
mode (C1DEF register's SSHT bit = 1))
1 1 CAN overrun error
0 0 Wake-up from CAN bus
Undefined
0 Address Initial value
Note
LREC0 xxxxmC54H 00FFH
Last error information