MSE08AZ60_1J35D MOTOROLA [Motorola, Inc], MSE08AZ60_1J35D Datasheet - Page 2

• Manufacturer Part Number: MSE08AZ60_1J35D
• Description: Mask Set Errata
• Manufacturer: MOTOROLA [Motorola, Inc]

MSE08AZ60_1J35D
MSCAN Extended ID Rejected if STUFF Bit Between ID16 and ID15
Workaround
2
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)
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).
Example 1: to receive the message IDs
xxxx xxxx x011 111x xxxx xxxx xxxx xxxx
IDMR1 etc. must be 111x xxx1, i.e. ID20,19,18,15 must be masked.
IDAR0
********
where
Affected extended IDs (ID28 - ID18) patterns:
Mask Set Errata for 68HC08AZ60, Mask 1J35D
xxxxxxxxx01
xxxxx100000
xxxx0111111
x0111110000
10000000000
11111111111
10000011111
x = 0 or 1 (don't care)
* = pattern for ID28 to ID18 (see following).
IDAR1
***1111x
exceptions:
exception:
exception:
Table 1.
IDAR2
xxxxxxxx
00000000001
01111100001
xxxx1000001 except 11111000001
01111100000
00000111111
IDAR3
xxxxxxxx
SE17-MSCAN
MOTOROLA