M16C1N Datasheet, PDF (161/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
16. CAN Module
16.8 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 16.22 shows the write and read of C0AFS register in word access.
Bit 15
When write
Bit 8 Bit 7
SID10 SID9 SID8 SID7 SID6
3/8 Decoder
SID5
SID4
SID3
SID2
SID1
Bit 0
SID0
Address
024516,
024416
Bit 15
When read
Bit 8 Bit 7
Bit 0
SID10 SID9
SID8 SID7
SID6 SID5
SID4
SID3
024516,
024416
Figure 16.22 Write/read of CiAFS Register in Word Access
Rev.1.00 Oct 20, 2004 page 149 of 222
REJ09B0007-0100Z