Allwinner A20 - Page 791

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 791 / 812
Offset: 0x08
Register Name:
CAN_STA_REG
Default Value: 0x0000_003C
Bit
Read/Write
Default
Description
10110 - Passive error flag
10011 - Tolerate dominant bits
10111 - Error delimiter
11100 - Overload flag
15:13
-
-
/
12:8
R
0
ARB_LOST
Arbitration Lost Capture
[0~10] – Arbitration lost in bit[0~10](1st~11th bit of ID,
ID.28~ID.18).
11 - Arbitration lost in bit[11](SRTR bit ).
12 - Arbitration lost in bit[12](IDE bit ).
[13~30] – Arbitration lost in bit[13th~30th](12th~29th bit of ID,
ID.17~ID.0).
31 - Arbitration lost in bit[31](RTR bit ).
7
R
0
BUS_STA
Bus Status
1 - The controller is in ‘Bus Off’ state and is not involved in bus
activities
0 - The controller is involved in bus activities
6
R
0
ERR_STA
Error Status
1 - At least one of the error counters has reached or exceeded
the CPU warning limit defined by the Error Warning Limit
Register (EWL).
0 - Both error counters are below the warning limit
5
R
1
TX_STA
Transmit Status
1 – controller is in the process of transmitting a message
0 – nothing is currently being Transmitted
4
R
1
RX_STA
Receive Status
1 – controller is in the process of receiving a message
0 – nothing is currently being received
3
R
1
TX_OVER
Transmission Complete
1 – The last requested transmission has been successfully