Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet
Product codes
AT91SAM9X25-EK
942
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
41.9.14 CAN Message Mode Register
Name:
CAN_MMRx [x=0..7]
Address:
0xF8000200 (0)[0], 0xF8000220 (0)[1], 0xF8000240 (0)[2], 0xF8000260 (0)[3], 0xF8000280 (0)[4],
0xF80002A0 (0)[5], 0xF80002C0 (0)[6], 0xF80002E0 (0)[7], 0xF8004200 (1)[0], 0xF8004220 (1)[1], 0xF8004240 (1)[2],
0xF8004260 (1)[3], 0xF8004280 (1)[4], 0xF80042A0 (1)[5], 0xF80042C0 (1)[6], 0xF80042E0 (1)[7]
0xF8004260 (1)[3], 0xF8004280 (1)[4], 0xF80042A0 (1)[5], 0xF80042C0 (1)[6], 0xF80042E0 (1)[7]
Access:
Read-write
This register can only be written if the WPEN bit is cleared in
.
• 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
Timemark. See
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.
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).
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:
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
7
6
5
4
3
2
1
0
MTIMEMARK
Value
Name
Description
0
MB_DISABLED
Mailbox is disabled. This prevents receiving or transmitting any messages with this
mailbox.
mailbox.
1
MB_RX
Reception Mailbox. Mailbox is configured for reception. If a message is received
while the mailbox data register is full, it is discarded.
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.
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.
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.
reception mailbox, i.e., it waits to receive a Remote Frame before sending its
contents.
6
–
Reserved