• Bit 0 – AERR: Acknowledgment Error
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the whole CANSTMOB
register.
No detection of the dominant bit in the acknowledge slot.
16.11.2 CAN MOb Control and DLC Register - CANCDMOB
Bit
7
6
5
4
3
2
1
0
CONMOB CONMOB
CANCDMO
B
RPLV
IDE
DLC3
DLC2
DLC1
DLC0
1
R/W
-
0
R/W
-
Read/Write
Initial Value
R/W
-
R/W
-
R/W
-
R/W
-
R/W
-
R/W
-
• Bit 7:6 – CONMOB1:0: Configuration of Message Object
These bits set the communication to be performed (no initial value after RESET).
●
●
●
●
00 - disable.
01 - enable transmission.
10 - enable reception.
11 - enable frame buffer reception
These bits are not cleared once the communication is performed. The user must re-write the configuration to enable a new
communication.
●
●
This operation is necessary to be able to reset the BXOK flag.
This operation also set the corresponding bit in the CANEN registers.
• Bit 5 – RPLV: Reply Valid
Used in the automatic reply mode after receiving a remote frame.
●
●
0 - reply not ready.
1 - reply ready and valid.
• Bit 4 – IDE: Identifier Extension
IDE bit of the remote or data frame to send.
This bit is updated with the corresponding value of the remote or data frame received.
●
●
0 - CAN standard rev 2.0 A (identifiers length = 11 bits).
1 - CAN standard rev 2.0 B (identifiers length = 29 bits).
• Bit 3:0 – DLC3:0: Data Length Code
Number of Bytes in the data field of the message.
DLC field of the remote or data frame to send. The range of DLC is from 0 up to 8. If DLC field >8 then effective DLC=8.
This field is updated with the corresponding value of the remote or data frame received. If the expected DLC differs from the
incoming DLC, a DLC warning appears in the CANSTMOB register.
168
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
