Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
700
33.9.14 CAN Message Mode Register
Name: CAN_MMRx [x=0..7]
Address: 0x40010200 (0)[0], 0x40010220 (0)[1], 0x40010240 (0)[2], 0x40010260 (0)[3], 0x40010280 (0)[4],
0x400102A0 (0)[5], 0x400102C0 (0)[6], 0x400102E0 (0)[7], 0x40014200 (1)[0], 0x40014220 (1)[1], 0x40014240 (1)[2],
0x40014260 (1)[3], 0x40014280 (1)[4], 0x400142A0 (1)[5], 0x400142C0 (1)[6], 0x400142E0 (1)[7]
Access: Read-write
This register can only be written if the WPEN bit is cleared in ”CAN Write Protection Mode Register”.
 MTIMEMARK: Mailbox Timemark
This field is active in Time Triggered Mode. Transmit operations are allowed when the internal timer counter reaches the
Mailbox Timemark. See “Transmitting within a Time Window” on page 677.
In Timestamp Mode, MTIMEMARK is set to 0.
 PRIOR: Mailbox Priority
This field has no effect in receive and receive with overwrite modes. In these modes, the mailbox with the lowest number is
serviced first.
When several mailboxes try to transmit a message at the same time, the mailbox with the highest priority is serviced first. If
several mailboxes have the same priority, the mailbox with the lowest number is serviced first (i.e., MBx0 is serviced before
MBx 15 if they have the same priority).
 MOT: Mailbox Object Type
This field allows the user to define the type of the mailbox. All mailboxes are independently configurable. Five different
types are possible for each mailbox:
31 30 29 28 27 26 25 24
–––––
MOT
23 22 21 20 19 18 17 16
–––– PRIOR
15 14 13 12 11 10 9 8
MTIMEMARK
76543210
MTIMEMARK
Value Name Description
0 MB_DISABLED
Mailbox is disabled. This prevents receiving or transmitting any messages with this
mailbox.
1MB_RX
Reception Mailbox. Mailbox is configured for reception. If a message is received
while the mailbox data register is full, it is discarded.
2 MB_RX_OVERWRITE
Reception mailbox with overwrite. Mailbox is configured for reception. If a message
is received while the mailbox is full, it overwrites the previous message.
3 MB_TX Transmit mailbox. Mailbox is configured for transmission.
4 MB_CONSUMER
Consumer Mailbox. Mailbox is configured in reception but behaves as a Transmit
Mailbox, i.e., it sends a remote frame and waits for an answer.
5 MB_PRODUCER
Producer Mailbox. Mailbox is configured in transmission but also behaves like a
reception mailbox, i.e., it waits to receive a Remote Frame before sending its
contents.
6–Reserved