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AFT
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DR
D
RAFT
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FT DRAF
D
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UM10316_0
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 00.06 — 17 December 2008
339 of 571
NXP Semiconductors
UM10316
Chapter 21: LPC29xx CAN 0/1
10.4 CAN acceptance-filter extended-frame explicit start-address register
The CAN acceptance-filter extended-frame explicit start-address register CAEFESA
defines the explicit start address of the section of extended identifiers in the acceptance-
filter look-up table.
shows the bit assignment of the CAEFESA register.
Table 286. CAN acceptance-filter standard-frame group start-address register bit description
(CASFGSA, address 0xE008 7008)
* = reset value
Bit
Symbol
Access
Value
Description
31 to 12 reserved
R
-
Reserved; do not modify. Read as logic 0
11 to 2
SFGSA[9:0]
R/W
Standard-frame group start address. This register
defines the start address of the section of grouped
standard identifiers in the acceptance-filter
look-up table. If this section is empty, write the
same value in this register and the EFESA
register. The largest value that should be written
to this register is 7FCh when only the standard
explicit section is used and the last word (address
7F8h) in the acceptance-filter look-up table is
used. Write access is only possible during
acceptance-filter bypass or acceptance-filter off
modes; read access is possible in acceptance-
filter on and off modes.
The standard-frame group start address is aligned
on word boundaries and therefore the lowest
two bits must be always logic 0
00h*
1 to 0
reserved
R
-
Reserved; do not modify. Read as logic 0
Table 287. CAEFESA register bit description (CAEFESA, address 0xE008 700C)
* = reset value
Bit
Symbol
Access
Value
Description
31 to 12 reserved
R
-
Reserved; do not modify. Read as logic 0