SAM7X256_14 Datasheet, PDF (528/662 Pages) ATMEL Corporation – ARM-based Flash MCU

36.8.16 CAN Message Status Register
Name:
CAN_MSRx
Access Type:
Read-only
31
30
29
28
27
–
–
–
–
–
23
22
21
20
19
MRDY
MABT
–
MRTR
26
25
24
–
–
MMI
18
17
16
MDLC
15
14
13
12
11
10
9
8
MTIMESTAMP15 MTIMESTAMP14 MTIMESTAMP13 MTIMESTAMP12 MTIMESTAMP11 MTIMESTAMP10 MTIMESTAMP9 MTIMESTAMP8
7
6
5
4
3
2
1
0
MTIMESTAMP7 MTIMESTAMP6 MTIMESTAMP5 MTIMESTAMP4 MTIMESTAMP3 MTIMESTAMP2 MTIMESTAMP1 MTIMESTAMP0
These register fields are updated each time a message transfer is received or aborted.
MMI is cleared by reading the CAN_MSRx register.
MRDY, MABT are cleared by writing MTCR or MACR in the CAN_MCRx register.
Warning: MRTR and MDLC state depends partly on the mailbox object type.
• MTIMESTAMP: Timer value
This field is updated only when time-triggered operations are disabled (TTM cleared in CAN_MR register). If the TEOF field in the
CAN_MR register is cleared, TIMESTAMP is the internal timer value at the start of frame of the last message received or sent by
the mailbox. If the TEOF field in the CAN_MR register is set, TIMESTAMP is the internal timer value at the end of frame of the last
message received or sent by the mailbox.
In Time Triggered Mode, MTIMESTAMP is set to 0.
• MDLC: Mailbox Data Length Code
Mailbox Object Type
Receive
Receive with overwrite
Transmit
Consumer
Producer
Description
Length of the first mailbox message received
Length of the last mailbox message received
No action
Length of the mailbox message received
Length of the mailbox message to be sent after the remote frame reception
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
528