Datasheet

931
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
41.9.5 CAN Status Register
Name: CAN_SR
Address: 0xF8000010 (0), 0xF8004010 (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 register.
• 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 register.
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 register.
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 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 register.
A node is in error passive state when TEC counter is greater or equal to 128 (decimal) or when the REC counter is greater 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 register.
This flag is set depending on TEC counter value. A node is in bus off state when TEC counter is greater or equal to 256 (decimal).
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
MB7MB6MB5MB4MB3MB2MB1MB0