Microcontrollers User manual

UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 522 of 792
NXP Semiconductors
UM10237
Chapter 18: LPC24XX CAN controllers CAN1/2
18.7 Configuration example 7
The Table below shows which sections and therefore which types of CAN identifiers are
used and activated. The ID-Look-up Table configuration of this example is shown in
Figure 18–93
.
This example uses a typical configuration in which FullCAN as well as Explicit Standard
Frame Format messages are defined. As described in Section 18–16.1 “
Acceptance filter
search algorithm”, acceptance filtering takes place in a certain order. With the enabled
FullCAN section, the identifier screening process of the acceptance filter starts always in
the FullCAN section first, before it continues with the rest of enabled sections.e disabled.
Fig 92. ID Look-up table configuration example (no FullCAN)
11
0
SCC
11
0
SCC
0
SCC 0
1
SCC
8
0
SCC
6
0
SCC
0
SCC
...
...
1
Explicit
Standard
Frame
Format
Identifier
Section
Group of
Standard
Frame
Format
Identifier
Section
SFF_GRP_sa
= 0x10
SFF_sa
= 0x00
2
0
SCC 3
0
SCC
Disabled, 7
8
0
SCC
Disabled, 9Disabled, 9
1
SCC
1
SCC
Message
disable bit
Message
disable bit
12SCC
ENDofTable
= 0x40
Explicit
Extended
Frame
Format
Identifier
Section
EFF_sa
= 0x20
Group of
Extended
Frame
Format
Identifier
Section
EFF_GRP_sa
= 0x30
13SCC
15SCC
16SCC
16SCC
17SCC
17SCC
Group 8
Disabled
Group 9
Group 11
Group 16
Group 17
MSB
ID28
LSB
ID18
0
SCC4
0
SCC 5
1010
1
SCC
1
SCC
14SCC
Group 10
Index
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
LSB
ID0
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
LSB
ID18
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
MSB
ID28
LSB
ID0
LSB
ID0
LSB
ID0
LSB
ID0
LSB
ID0
LSB
ID0
LSB
ID0
LSB
ID18
Table 458. Used ID-Look-up Table sections
ID-Look-up Table Section Status
FullCAN activated and enabled
Explicit Standard Frame Format activated
Group of Standard Frame Format not activated
Explicit Extended Frame Format not activated
Group of Extended Frame Format not activated