Error Code Capture Register; Table 22-19. Ecc Register; Table 22-20. Ecc Register Definitions - Sharp Blue Treak LH75400 User Manual

Controller Area Network

22.3.2.9 Error Code Capture Register

ECC is the Error Code Capture Register. The ECC Register contains information about the
type and location of errors on the bus.
When a bus error occurs:
• A Bus Error Interrupt is generated (if enabled) and the current bit position of the Bit
Processor is captured into this Error Code 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 Error Code Capture Register appears to the CPU as Read Only memory.
BIT
FIELD
RESET
RW
BIT
FIELD
RESET
RW
ADDR
BIT
31:8
7:6
5
4:0 Segment Code Segment Code Shows the segment code (see Table 22-22).
22-18

Table 22-19. ECC 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 22-20. ECC Register Definitions

NAME
Reserved Writing to these bits has no effect. Reading returns 0.
///
Error Code Error Code Shows the error code that occurred (see Table 22-21).
Error Direction
Direction 0 = Error occurred during transmission.
1 = Error occurred during reception.
ERROR CODE BITS [7:6]
LH75400/01/10/11 (Preliminary) User's Guide
26 25 24 23
///
0 0 0 0
R R R R
10 9 8 7
Error Code
0 0 0 0
R R R R
0xFFFC5000 + 0x30
DESCRIPTION
Table 22-21. Error Code
DESCRIPTION
Bit error
0 0
0 1 Form error
1 0 Stuff error
1 1 Other types of errors
6/17/03
22 21 20 19 18
0 0 0 0 0
R R R R R
6 5 4 3 2
Segment Code
0 0 0 0 0
R R
17 16
0 0
R R
1 0
0 0