Datasheet

20.11.18. CAN MOb Status Register
Name: CANSTMOB
Offset: 0xEE
Reset:
Property: R/W
Bit 7 6 5 4 3 2 1 0
DLCW TXOK RXOK BERR SERR CERR FERR AERR
Access
Reset
Bit 7 – DLCW: Data Length Code Warning
The incoming message does not have the DLC expected. Whatever the frame type, the DLC field of the
CANCDMOB register is updated by the received DLC.
Bit 6 – TXOK: Transmit OK
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the
whole CANSTMOB register.
The communication enabled by transmission is completed. TxOK rises at the end of EOF field. When the
controller is ready to send a frame, if two or more message objects are enabled as producers, the lower
MOb index (0 to 14) is supplied first.
Bit 5 – RXOK: Receive OK
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the
whole CANSTMOB register.
The communication enabled by reception is completed. RxOK rises at the end of the 6th bit of EOF field.
In case of two or more message object reception hits, the lower MOb index (0 to 14) is updated first.
Bit 4 – BERR: Bit Error (Only in Transmission)
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the
whole CANSTMOB register.
The bit value monitored is different from the bit value sent.
Exceptions: the monitored recessive bit sent as a dominant bit during the arbitration field and the
acknowledge slot detecting a dominant bit during the sending of an error frame.
Bit 3 – SERR: Stuff Error
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the
whole CANSTMOB register.
Detection of more than five consecutive bits with the same polarity. This flag can generate an interrupt.
Bit 2 – CERR: CRC Error
This flag can generate an interrupt. It must be cleared using a read-modify-write software routine on the
whole CANSTMOB register.
The receiver performs a CRC check on every de-stuffed received message from the start of frame up to
the data field. If this checking does not match with the de-stuffed CRC field, a CRC error is set.
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
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