SAM7X256_14 Datasheet, PDF (529/662 Pages) ATMEL Corporation – ARM-based Flash MCU

• MRTR: Mailbox Remote Transmission Request
Mailbox Object Type Description
Receive
The first frame received has the RTR bit set.
Receive with overwrite The last frame received has the RTR bit set.
Transmit
Reserved
Consumer
Reserved. After setting the MOT field in the CAN_MMR, MRTR is reset to 1.
Producer
Reserved. After setting the MOT field in the CAN_MMR, MRTR is reset to 0.
• MABT: Mailbox Message Abort
An interrupt is triggered when MABT is set.
0 = Previous transfer is not aborted.
1 = Previous transfer has been aborted.
This flag is cleared by writing to CAN_MCRx register
Mailbox Object Type Description
Receive
Reserved
Receive with overwrite Reserved
Transmit
Previous transfer has been aborted
Consumer
The remote frame transfer request has been aborted.
Producer
The response to the remote frame transfer has been aborted.
• MRDY: Mailbox Ready
An interrupt is triggered when MRDY is set.
0 = Mailbox data registers can not be read/written by the software application. CAN_MDx are locked by the CAN_MDx.
1 = Mailbox data registers can be read/written by the software application.
This flag is cleared by writing to CAN_MCRx register.
Mailbox Object Type Description
Receive
At least one message has been received since the last mailbox transfer order. Data from the first frame
received can be read in the CAN_MDxx registers.
After setting the MOT field in the CAN_MMR, MRDY is reset to 0.
Receive with overwrite
At least one frame has been received since the last mailbox transfer order. Data from the last frame
received can be read in the CAN_MDxx registers.
After setting the MOT field in the CAN_MMR, MRDY is reset to 0.
Transmit
Mailbox data have been transmitted.
After setting the MOT field in the CAN_MMR, MRDY is reset to 1.
Consumer
At least one message has been received since the last mailbox transfer order. Data from the first message
received can be read in the CAN_MDxx registers.
After setting the MOT field in the CAN_MMR, MRDY is reset to 0.
Producer
A remote frame has been received, mailbox data have been transmitted.
After setting the MOT field in the CAN_MMR, MRDY is reset to 1.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
529