Arbitration Lost Capture Register; Table 22-16. Alc Register; Table 22-17. Alc Register Definitions - Sharp Blue Treak LH75400 User Manual

Controller Area Network

22.3.2.8 Arbitration Lost Capture Register

ALC is the Arbitration Lost Capture Register. This register records the bit position at which
arbitration was lost.
When bus arbitration is lost:
• An Arbitration Lost Interrupt is generated (if enabled) and the current bit position of the
Bit Processor is captured into this Arbitration Lost Capture Register.
• The contents of this register are maintained until the register has been read by user
software. Then the capture mechanism is activated again.
The Arbitration Lost Capture Register appears to the CPU as Read Only memory. The
Reserved bits always return '0'.
BIT
FIELD
RESET
RW
BIT
FIELD
RESET
RW
ADDR
BITS
31:5
4:0
22-16

Table 22-16. ALC Register

31 30 29 28 27
0 0 0 0 0
R R R R R
15 14 13 12 11
0 0 0 0 0
R R R R R

Table 22-17. ALC Register Definitions

NAME
/// Reserved Writing to these bits has no effect. Reading returns 0.
Arbitration Arbitration Loss Specifies a value from Table 22-18, indicating the
Loss cause for losing arbitration.
LH75400/01/10/11 (Preliminary) User's Guide
26 25 24 23 22
///
0 0 0 0
R R R R R
10 9 8 7
///
0 0 0 0
R R R R R
0xFFFC5000 + 0x2C
DESCRIPTION
6/17/03
21 20 19 18
0 0 0 0 0
R R R R
6 5 4 3 2
Arbitration Loss
0 0 0 0 0
R R R R
17 16
0 0
R R
1 0
0 0
R R