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M16C/29 Group
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: 078
• 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.
bit 15
When write
bit 15
When read
Figure 17.23 Write/read of C0AFS Register in Word Access
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
, 087
, 111
16
16
SID
SID
SID
10
9
3/8 Decoder
page 299 of 402
16
bit 8
bit 7
SID
SID
SID
8
7
6
bit 8 bit 7
SID
SID
SID
10
9
bit 0
SID
SID
SID
SID
SID
5
4
3
2
1
bit 0
SID
SID
SID
SID
SID
8
7
6
5
4
17. CAN Module
Address
CAN0
242
0
16
242
3
16
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