參數(shù)資料
型號: MSE08AZ60_1J35D
廠商: Motorola, Inc.
英文描述: Mask Set Errata
中文描述: 掩模組的勘誤表
文件頁數(shù): 2/4頁
文件大?。?/td> 54K
代理商: MSE08AZ60_1J35D
MSE08AZ60_1J35D
2
Mask Set Errata for 68HC08AZ60, Mask 1J35D
MOTOROLA
MSCAN Extended ID Rejected if STUFF Bit Between ID16 and ID15
SE17-MSCAN
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:
where
x = 0 or 1 (don't care)
*
= pattern for ID28 to ID18 (see following).
Affected extended IDs (ID28 - ID18) patterns:
a)
xxxxxxxxx01
exceptions:
00000000001
01111100001
xxxx1000001
except
11111000001
b)
xxxxx100000
exception:
01111100000
c)
xxxx0111111
exception:
00000111111
d)
x0111110000
e)
10000000000
f)
11111111111
g)
10000011111
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).
Workaround
IftheproblematicIDscannotbeavoided,theworkaroundistomaskcertainbits
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.
Table 1.
IDAR0
IDAR1
IDAR2
IDAR3
********
***1111x
xxxxxxxx
xxxxxxxx
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