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Figure 14-28: Message Data Registers m0 to m7 (M_DATAm0 to M_DATAm7) (m = 00 to 31) (2/2)
Bit Position
Bit Name
7 to 0
D0_7 to
(M_DATAm0)
D0_0
7 to 0
D1_7 to
(M_DATAm1)
D1_0
7 to 0
D2_7 to
(M_DATAm2)
D2_0
7 to 0
D3_7 to
(M_DATAm3)
D3_0
7 to 0
D4_7 to
(M_DATAm4)
D4_0
7 to 0
D5_7 to
(M_DATAm5)
D5_0
7 to 0
D6_7 to
(M_DATAm6)
D6_0
7 to 0
D7_7 to
(M_DATAm7)
D7_0
Note: The register address is calculated according to the following formula:
effective address = PP_BASE + 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.
Chapter 14 FCAN Interface Function
Contents of the message data byte 0. (first message data byte)
Contents of the message data byte 1.
Contents of the message data byte 2.
Contents of the message data byte 3.
Contents of the message data byte 4.
Contents of the message data byte 5.
Contents of the message data byte 6.
Contents of the message data byte 7.
Preliminary User's Manual U15839EE1V0UM00
Function
479
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