501
Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(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)
Note: The register address is calculated according to the following formula:
effective address = P address offset
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Offset
Note
Initial
value
C1BA
0
0
0
CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
105AH
00FFH
C2BA
0
0
0
CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
109AH
00FFH
C3BA
0
0
0
CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
10DAH
00FFH
C4BA
0
0
0
CACT4 CACT3 CACT2 CACT1 CACT0 TMNO7 TMNO6 TMNO5 TMNO4 TMNO3 TMNO2 TMNO1 TMNO0
111AH
00FFH
Bit Position
Bit Name
Function
12 to 8
CACT4 to
CACT0
Indicates the CAN module activity.
Remark:
The CACT4 to CACT0 bits reflect the status of the CAN protocol layer.
CACT4
CACT3
CACT2
CACT1
CACT0
CAN Module Activity
0
0
0
0
0
Reset state
0
0
0
0
1
Waiting for bus idle
0
0
0
1
0
Bus idle
0
0
0
1
1
Start of frame (SOF)
0
0
1
0
0
Standard format ID section
0
0
1
0
1
Data length code section
0
0
1
1
0
Data field section
0
0
1
1
1
CRC field section
0
1
0
0
0
CRC delimiter
0
1
0
0
1
Acknowledge slot
0
1
0
1
0
Acknowledge delimiter
0
1
0
1
1
End of frame section (EOF)
0
1
1
0
0
Intermission state
0
1
1
0
1
Suspend transmission
0
1
1
1
0
Error frame
0
1
1
1
1
Waiting for error delimiter
1
0
0
0
0
Error delimiter
1
0
0
0
1
Error bus-off
1
0
0
1
0
Extended format ID section
1
0
0
1
1
Suspend mode
Others than above
Reserved
Содержание mPD703128
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