M32CSLASH86 datasheet(370/505 Pages) RENESAS

370 / 505 page

Page 347

23. CAN Module

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The CiGMRk, CiLMARk and CiLMBRk registers are used for acceptance filtering. The users can

select and receive user-desired messages.

The CiGMRk register determines whether IDs in the message slots 0 to 13 are verified. The CiLMARk

whether ID in the message slot 15 is verified.

• When bits in these registers are set to "0", each standard ID0 and standard ID1 bits (ID bit) and

extended ID0 to extended ID2 bits in the CANi message slots j (j=0 to 15) corresponding to the bits

in the above registers, is masked while acceptance filtering. (The corresponding bits are assumed

to have matching IDs.)

• When bits in these registers are set to "1", corresponding ID bits are compared with received IDs

while acceptance filtering. If the received ID matches the ID in the message slot j, the received

data having the matched ID is stored into that message slot.

NOTES:

1. Change the CiGMRk register setting only when the message slots 0 to 13 have no receive request.

2. Change the CiLMARk register setting only when the message slot 14 has no receive request.

3. Change the CiLMBRk register setting only when the message slot 15 has no receive request.

4. More than two message slots are able to store a receive message ID, the ID is stored into the

message slot, having the smallest slot number.

Figure 23.27 shows each mask register and corresponding message slot. Figure 23.28 shows the

acceptance filtering.

M32C/86 Datasheet(PDF) 370 Page - Renesas Technology Corp