Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 195)

195

7647A–AVR–02/08

ATmega32/64/M1/C1

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.

• Bit 1 – FERR: Form Error

This flag can generate an interrupt. It must be cleared using a read-modify-write software routine

on the whole CANSTMOB register.

The form error results from one or more violations of the fixed form in the following bit fields:

• CRC delimiter.

• Acknowledgment delimiter.

•EOF

• 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 – 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.

Bit 7 6 543210

CONMOB1 CONMOB0 RPLV IDE DLC3 DLC2 DLC1 DLC0

CANCDMOB

Read/Write R/W R/W R/W R/W R/W R/W R/W R/W

Initial Value- - ------

1 2 ... 190 191 192 193 194 195 196 197 198 199 200 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 195