506
Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
The CxSYNC registers specify the data bit time (DBT), sampling point position (SPT) and syn-
chronisation jump width (SJW) 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/written in 8-bit and 16-bit units. However, write access is only permit-
ted in initialisation mode (ISTAT bit of the CxCTRL register = 1)
Figure 14-42:
CAN 1 to 4 Synchronization Control Registers (C1SYNC to C4SYNC) (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
C1SYNC
0
0
0
SAMP SJWR1 SJWR0 SPTR4 SPTR3 SPTR2 SPTR1 SPTR0 DBTR4 DBTR3 DBTR2 DBTR1 DBTR0
105EH
0218H
C2SYNC
0
0
0
SAMP SJWR1 SJWR0 SPTR4 SPTR3 SPTR2 SPTR1 SPTR0 DBTR4 DBTR3 DBTR2 DBTR1 DBTR0
109EH
0218H
C3SYNC
0
0
0
SAMP SJWR1 SJWR0 SPTR4 SPTR3 SPTR2 SPTR1 SPTR0 DBTR4 DBTR3 DBTR2 DBTR1 DBTR0
10DEH
0218H
C4SYNC
0
0
0
SAMP SJWR1 SJWR0 SPTR4 SPTR3 SPTR2 SPTR1 SPTR0 DBTR4 DBTR3 DBTR2 DBTR1 DBTR0
111EH
0218H
Bit Position
Bit Name
Function
12
SAMP
Specifies the bit sampling.
0: Sample receive data one time at sampling point.
1: Sample receive data three times and take majority decision at sampling point.
11, 10
SJWR1,
SJWR0
Specifies the synchronization jump width.
9 to 5
SPTR4 to
SPTR0
Specifies the sampling point position.
SJWR1
SJWR0
Synchronization Jump Width
0
0
1 TQ
0
1
2 TQ
1
0
3 TQ
1
1
4 TQ
SPTR4 SPTR3 SPTR2 SPTR1 SPTR0
Sampling Point Position
SPTR = (p + 1) TQ
p
0
0
0
0
0
Setting prohibited
0
0
0
0
1
0
0
0
1
0
3 TQ
2
0
0
0
1
1
4 TQ
3
0
0
1
0
0
5 TQ
4
·
·
·
·
·
·
·
·
·
1
0
0
0
0
17 TQ
16
Other than above
Setting prohibited
Содержание mPD703128
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