Acceptance Filter Support Unit (Asu) - Renesas M16C/60 Series Hardware Manual

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M16C/6N5 Group

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 1.19.24 shows the write and read of C0AFS register in word access.
Bit 15
When write
Bit 15
When read
Figure 1.19.24 Write/read of C0AFS Register in Word Access
Rev.1.00 2003.05.30 page 221
, 087 , 111
16 16 16
Bit 8 Bit 7
SID SID SID SID SID
10 9 8 7 6
3/8 Decoder
Bit 8 Bit 7
SID
SID SID SID SID
5 4 3 2
SID SID SID SID SID
10 9 8 7 6 5
CAN Module
Address
CAN0
Bit 0
SID SID
242
1 0
16
Bit 0
SID SID
242
4 3
16