SAM7X128_14 Datasheet, PDF (524/662 Pages) ATMEL Corporation – ARM-based Flash MCU

36.8.12 CAN Message Mode Register
Name:
CAN_MMRx
Access Type:
Read-write
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
MTIMEMARK15 MTIMEMARK14 MTIMEMARK13 MTIMEMARK12 MTIMEMARK11 MTIMEMARK10 MTIMEMARK9
8
MTIMEMARK8
7
MTIMEMARK7
6
MTIMEMARK6
5
MTIMEMARK5
4
MTIMEMARK4
3
MTIMEMARK3
2
MTIMEMARK2
1
MTIMEMARK1
0
MTIMEMARK0
• 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 504.
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 ser-
viced first.
When several mailboxes try to transmit a message at the same time, the mailbox with the highest priority is serviced first. If sev-
eral 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:
MOT
Mailbox Object Type
0
0
0
Mailbox is disabled. This prevents receiving or transmitting any messages
with this mailbox.
0
0
1
Reception Mailbox. Mailbox is configured for reception. If a message is
received while the mailbox data register is full, it is discarded.
Reception mailbox with overwrite. Mailbox is configured for reception. If a
0
1
0
message is received while the mailbox is full, it overwrites the previous
message.
0
1
1
Transmit mailbox. Mailbox is configured for transmission.
1
0
0
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.
Producer Mailbox. Mailbox is configured in transmission but also behaves
1
0
1
like a reception mailbox, i.e., it waits to receive a Remote Frame before
sending its contents.
1
1
X
Reserved
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
524