Fujitsu F2MC-16LX Series, Hardware Manual

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CHAPTER 16 CAN controller
16.3.23 Data Register (DTR)
Data register (DTR) for message buffer. The data register (DTR) sets the messages at
transmitting or receiving a data frame.The data length can be set from 0 to 8 bytes.
■
Data Register (DTR)
Figure 16.3-30 Data Register (DTR)
bit7
R/W
D7
Reset value
X X X X X X X X
B
Reset value
X X X X X X X X
B
D6 BYTE0
BYTE7
D5 D4 D3 D2 D1 D0
6
R/W
5
R/W
4
R/W
3
R/W
2
R/W
1
R/W
0
R/W
bit15
R/W
D7 D6 D5 D4 D3 D2 D1 D0
14
R/W
13
R/W
12
R/W
11
R/W
10
R/W
9
R/W
8
R/W
X :Undefined
R/W :Read/Write
Table 16.3-25 Functions of Data Register (DTR)
Bit name Function
bit0
:
:
D7 to 0 (BYTE7 to 0) :
Data bit 7 to 0
• The data register (DTRx) is used only for transmitting or
receiving a data frame.
• The transmit message is set up to 8 bytes. The received mes-
sage is stored on an MSB-first basis starting with the small
message buffer number (BYTE0 to BYTE7).
• The received message is stored. The received message is
stored on an MSB-first basis starting with the small message
buffer number (BYTE0 to BYTE7).
• If the received message is less than 8 bytes, undefined data is
stored in the rest of the bytes of the data register (DTRx).
However this does not affect the operation.
Note:
When setting the data register (DTR), write by words.
Writing by bytes is disabled.
:
bit15