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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
Figure 14-28:
Message Data Registers m0 to m7 (M_DATAm0 to M_DATAm7) (m = 00 to 31) (2/2)
Note: The register address is calculated according to the following formula:
effective address = P address offset
Remark:
m = 00 to 31
Cautions: 1. When transmitting data, only the number of bytes defined by the data length code
(DLC) in the M_DLCm register are transmitted on the CAN bus. The transmission
always starts with M_DATAm0.
2. If the ATS flag of the corresponding CxCTRL register is set (1) and the data length
code (DLC) in the M_DLCm register is greater or equal 2, the last two bytes which
are normally taken from the data part of the message buffer are ignored, and
instead of these bytes a time stamp value is sent. (x = 1 to 2 for the derivative
µPD703128 (A). x = 1 to 4 for the derivatives µPD703129 (A) and µPD703129 (A1))
(refer to chapter 14.2.5 “Time stamp” on page 441)
3. When a new message is received, all data bytes are updated, even if the data
length code (DLC) in the M_DLCm register is less than 8. The values of the data
bytes that have not been received may be change undefined.
Bit Position
Bit Name
Function
7 to 0
(M_DATAm0)
D0_7 to
D0_0
Contents of the message data byte 0. (first message data byte)
7 to 0
(M_DATAm1)
D1_7 to
D1_0
Contents of the message data byte 1.
7 to 0
(M_DATAm2)
D2_7 to
D2_0
Contents of the message data byte 2.
7 to 0
(M_DATAm3)
D3_7 to
D3_0
Contents of the message data byte 3.
7 to 0
(M_DATAm4)
D4_7 to
D4_0
Contents of the message data byte 4.
7 to 0
(M_DATAm5)
D5_7 to
D5_0
Contents of the message data byte 5.
7 to 0
(M_DATAm6)
D6_7 to
D6_0
Contents of the message data byte 6.
7 to 0
(M_DATAm7)
D7_7 to
D7_0
Contents of the message data byte 7.
Содержание mPD703128
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