Datasheet

689
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
33.9.5 CAN Status Register
Name: CAN_SR
Address: 0x40010010 (0), 0x40014010 (1)
Access: Read-only
 MBx: Mailbox x Event
0: No event occurred on Mailbox x.
1: An event occurred on Mailbox x.
An event corresponds to MRDY, MABT fields in the CAN_MSRx.
 ERRA: Error Active Mode
0: CAN controller has not reached Error Active Mode since the last read of CAN_SR.
1: CAN controller has reached Error Active Mode since the last read of CAN_SR.
This flag is automatically cleared by reading CAN_SR.
This flag is set depending on TEC and REC counter values. It is set when a node is neither in Error Passive Mode nor in
Bus Off Mode.
 WARN: Warning Limit
0: CAN controller Warning Limit has not been reached since the last read of CAN_SR.
1: CAN controller Warning Limit has been reached since the last read of CAN_SR.
This flag is automatically cleared by reading CAN_SR.
This flag is set depending on TEC and REC counter values. It is set when at least one of the counter values has reached a
value greater than or equal to 96.
 ERRP: Error Passive Mode
0: CAN controller has not reached Error Passive Mode since the last read of CAN_SR.
1: CAN controller has reached Error Passive Mode since the last read of CAN_SR.
This flag is set depending on TEC and REC counters values.
This flag is automatically cleared by reading CAN_SR.
A node is in error passive state when TEC counter is greater than or equal to 128 (decimal) or when the REC counter is
greater than or equal to 128 (decimal).
 BOFF: Bus Off Mode
0: CAN controller has not reached Bus Off Mode.
1: CAN controller has reached Bus Off Mode since the last read of CAN_SR.
This flag is automatically cleared by reading CAN_SR.
31 30 29 28 27 26 25 24
OVLSY TBSY RBSY BERR FERR AERR SERR CERR
23 22 21 20 19 18 17 16
TSTP TOVF WAKEUP SLEEP BOFF ERRP WARN ERRA
15 14 13 12 11 10 9 8
––––––––
76543210
MB7 MB6 MB5 MB4 MB3 MB2 MB1 MB0