NEC UPD703116 User Manual page 589

(25) CAN1 bus active register (C1BA)
The C1BA register indicates frame information output via the CAN bus.
This register is read-only, in 16-bit units.
15 14 13 12
C1BA 0 0 0 CACT4 CACT3
Bit position Bit name
12 to 8 CACT4 to
CACT0
7 to 0 TMNO7 to
TMNO0
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
CHAPTER 11 FCAN CONTROLLER
11 10 9 8 7 6
CACT2 CACT1 CACT0 TMNO7 TMNO6
Indicates CAN module status.
CACT4 CACT3 CACT2
0 0 0
0 0 0
0 0 0
0 0 0
0 0 1
0 0 1
0 0 1
0 0 1
0 1 0
0 1 0
0 1 0
0 1 0
0 1 1
0 1 1
0 1 1
0 1 1
1 0 0
1 0 0
Specifies transmit message counter.
0 to 31: Message number of message awaiting transmission or being transmitted
32 to 254: Not used
255: No messages awaiting transmission or being transmitted
User's Manual U14492EJ5V0UD
5 4 3 2 1 0
TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
Function
CACT1 CACT0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
1 0
Address Initial value
Note
xxxxmC5AH 00FFH
CAN module status
Reset state
Bus idle wait
Bus idle state
Start of frame
Standard identifier area
Data length code area
Data field area
CRC field area
CRC delimiter
ACK slot
ACK delimiter
End of frame area
Intermission state
Suspend transmission
Error frame
Error delimiter wait
Error delimiter
Extended identifier area
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