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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(10) CAN 1 to 4 bus diagnostic information registers (C1DINF to C4DINF)
The CxDINF registers reflect the last transmission on CAN bus 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 1-bit, 8-bit and 16-bit units. It is only accessible when diagnos-
tic mode is set (CxDEF register’s MOM bit = 1).
Figure 14-43:
CAN 1 to 4 Bus Diagnostic Information Registers (C1DINF to C4DINF)
Remarks: 1. The CAN bus diagnostic information shows all CAN bus bits including stuff bits, delimit-
ers, etc.
2. The storage of the last 8 bits is automatically stopped either when detecting an error on
the CAN bus or when detecting a valid message (acknowledge delimiter). It is automati-
cally reset whenever a SOF is detected on the CAN bus.
Caution:
In normal operating mode the CxDINF register is hidden, and the corresponding
CxBRP register appears instead of it at the same address.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Offset
Note
Initial
value
C1DINF DINF15 DINF14 DINF13 DINF12 DINF11 DINF10 DINF9 DINF8 DINF7 DINF6 DINF5 DINF4 DINF3 DINF2 DINF1 DINF0
105CH
0000H
C2DINF DINF15 DINF14 DINF13 DINF12 DINF11 DINF10 DINF9 DINF8 DINF7 DINF6 DINF5 DINF4 DINF3 DINF2 DINF1 DINF0
109CH
0000H
C3DINF DINF15 DINF14 DINF13 DINF12 DINF11 DINF10 DINF9 DINF8 DINF7 DINF6 DINF5 DINF4 DINF3 DINF2 DINF1 DINF0
10DCH
0000H
C4DINF DINF15 DINF14 DINF13 DINF12 DINF11 DINF10 DINF9 DINF8 DINF7 DINF6 DINF5 DINF4 DINF3 DINF2 DINF1 DINF0
111CH
0000H
Bit Position
Bit Name
Function
15 to 8
DINF15 to
DINF8
Number of bits detected on the CAN bus since the last occurrence of a SOF signal.
7 to 0
DINF7 to
DINF0
Reflects the value of the last 8 bits transmitted on the CAN bus, where DINF0 holds
the very last bit.
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