17. CAN Module
puorG92/C61M
page 306
854fo7002,03.raM21.1.veR
2110-1010B90JER
17.5 Acceptance Filter Support Unit (ASU)
The acceptance filter support unit has a function to judge valid/invalid of a received ID through table search.
The IDs to receive are registered in the data table; a received ID is stored in the C0AFS register, and table
search is performed with a decoded received ID. The acceptance filter support unit can be used for the IDs
of the standard frame only.
The acceptance filter support unit is valid in the following cases.
• When the ID to receive cannot be masked by the acceptance filter.
(Example) IDs to receive: 07816, 08716, 11116
• When there are too many IDs to receive; it would take too much time to filter them by software.
Figure 17.23 shows the write and read of the C0AFS register in word access.
Figure 17.23 Write/read of C0AFS Register in Word Access
bit 15
bit 0
When read
SID
10
SID
9
SID
8
SID
7
SID
6
SID
5
SID
4
SID
3
bit 15
bit 0
SID
10
SID
9
SID
8
SID
7
SID
6
SID
5
SID
4
SID
3
SID
2
SID
1
SID
0
When write
3/8 Decoder
242
16
242
16
Address
CAN0
bit 8
bit 7
bit 8 bit 7
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