Figure 14-39: Can 1 To 4 Bus Activity Registers (C1Ba To C4Ba) (1/2) - NEC V850E/CA2 JUPITER Preliminary User's Manual

(7) CAN 1o 4 bus activity registers (C1BA to C4BA)
The CxBA registers indicate the status of the CAN bus activities of the corresponding CAN module
x (x = 1 to 4 for the derivatives µPD703129(A) and µPD703129(A1), x = 1 to 2 for the derivative
µPD703128(A)).
These registers can be read-only in 8-bit and 16-bit units.

Figure 14-39: CAN 1 to 4 Bus Activity Registers (C1BA to C4BA) (1/2)

15 14 13
C1BA 0 0 0 CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
C2BA 0 0 0 CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
C3BA 0 0 0 CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
C4BA 0 0 0 CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
Bit Position Bit Name
CACT4 to
12 to 8
CACT0
Note: The register address is calculated according to the following formula:
effective address = PP_BASE + address offset
Chapter 14 FCAN Interface Function
12 11 10 9 8
Indicates the CAN module activity.
CACT4 CACT3
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
1 0
1 0
1 0
1 0
Others than above
Remark: The CACT4 to CACT0 bits reflect the status of the CAN protocol layer.
Preliminary User's Manual U15839EE1V0UM00
7 6 5 4
Function
CACT2 CACT1 CACT0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
Address
3 2 1 0
Offset
105AH
109AH
10DAH
111AH
CAN Module Activity
Reset state
Waiting for bus idle
Bus idle
Start of frame (SOF)
Standard format ID section
Data length code section
Data field section
CRC field section
CRC delimiter
Acknowledge slot
Acknowledge delimiter
End of frame section (EOF)
Intermission state
Suspend transmission
Error frame
Waiting for error delimiter
Error delimiter
Error bus-off
Extended format ID section
Suspend mode
Reserved
Initial
Note
value
00FFH
00FFH
00FFH
00FFH
501