MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 356

• Manufacturer Part Number: MC68HC08AZ60ACFU
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MSCAN08 Controller (MSCAN08)
21.6.1 MSCAN Extended ID Rejected if Stuff Bit Between ID16 and ID15
21.6.1.1 Work- around
Advance Information
356
For 32-bit and 16-bit identifier acceptance modes, an extended ID CAN
frame with a stuff bit between ID16 and ID15 can be erroneously
rejected, depending on IDAR0, IDAR1, and IDMR1.
Extended IDs (ID28-ID0) which generate a stuff bit between ID16 and
ID15:
a)
11111000001
b)
c)
d)
e)
f)
g)
When an affected ID is received, an incorrect value is compared to the
2nd byte of the filter (IDAR1 and IDAR5, plus IDAR3 and IDAR7 in 16-
bit mode). This incorrect value is the shift register contents before ID15
is shifted in (i.e. right shifted by 1).
If the problematic IDs cannot be avoided, the workaround is to mask
certain bits with IDMR1 (and IDMR5, plus IDMR3 and IDMR7 in 16-bit
mode).
IDAR0
********
where x = 0 or 1 (don’t care)
Affected extended IDs (ID28 - ID18) patterns:
xxxxxxxxx01
xxxxx100000
xxxx0111111
x0111110000
10000000000
11111111111
10000011111
MSCAN08 Controller (MSCAN08)
* = pattern for ID28 to ID18 (see following).
IDAR1
***1111x
exceptions: 00000000001
exception:
exception:
IDAR2
xxxxxxxx
01111100001
xxxx1000001 except
01111100000
00000111111
IDAR3
xxxxxxxx
MC68HC08AZ60A — Rev 0.0
MOTOROLA