SAM7X256_14 Datasheet, PDF (534/662 Pages) ATMEL Corporation – ARM-based Flash MCU

• MACR: Abort Request for Mailbox x
Mailbox Object Type
Receive
Receive with overwrite
Transmit
Consumer
Producer
Description
No action
No action
Cancels transfer request if the message has not been transmitted to the
CAN transceiver.
Cancels the current transfer before the remote frame has been sent.
Cancels the current transfer. The next remote frame will not be serviced.
It is possible to set MACR field for several mailboxes in the same time, setting several bits to the CAN_ACR register.
• MTCR: Mailbox Transfer Command
Mailbox Object Type
Receive
Receive with overwrite
Transmit
Consumer
Producer
Description
Allows the reception of the next message.
Triggers a new reception.
Sends data prepared in the mailbox as soon as possible.
Sends a remote transmission frame.
Sends data prepared in the mailbox after receiving a remote frame from a
Consumer.
This flag clears the MRDY and MABT flags in the CAN_MSRx register.
When several mailboxes are requested to be transmitted simultaneously, they are transmitted in turn. The mailbox with the high-
est priority is serviced first. If several mailboxes have the same priority, the mailbox with the lowest number is serviced first (i.e.,
MBx0 will be serviced before MBx 15 if they have the same priority).
It is possible to set MTCR for several mailboxes at the same time by writing to the CAN_TCR register.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
534