M16CSLASH29 datasheet(329/499 Pages) RENESAS

329 / 499 page

17. CAN Module

page 305

Figure 17.21 Correspondence of Mask Registers to Slots

Figure 17.22 Acceptance Function

When using the acceptance function, note the following points.

(1) When one ID is defined in two slots, the one with a smaller number alone is valid.

(2) When it is configured that slots 14 and 15 receive all IDs with Basic CAN mode, slots 14 and 15

receive all IDs which are not stored into slots 0 to 13.

17.4 Acceptance Filtering Function and Masking Function

These functions serve the users to select and receive a facultative message. The C0GMR register, the

C0LMAR register, and the C0LMBR register can perform masking to the standard ID and the extended ID

of 29 bits. The C0GMR register corresponds to slots 0 to 13, the C0LMAR register corresponds to slot 14,

and the C0LMBR register corresponds to slot 15. The masking function becomes valid to 11 bits or 29 bits

of a received ID according to the value in the corresponding slot of the C0IDR register upon acceptance

filtering operation. When the masking function is employed, it is possible to receive a certain range of IDs.

Figure 17.21

shows correspondence of the mask registers and slots, Figure 17.22 shows the acceptance

function.

Slot #0

Slot #1

Slot #2

Slot #3

Slot #4

Slot #5

Slot #6

Slot #7

Slot #8

Slot #9

Slot #10

Slot #11

Slot #12

Slot #14

Slot #15

C0GMR register

Slot #13

C0LMAR register

C0LMBR register

ID of the

received message

ID stored in

the slot

The value of the

mask register

Acceptance Signal

Mask Bit Values

Acceptance judge signal

0: The CAN module ignores the

current incoming message

(Not stored in any slot)

1: The CAN module stores the

current incoming message in

a slot of which ID matches

0: ID (to which the received message

corresponds) match is handled as

"Don't care"

1: ID (to which the received message

corresponds) match is checked

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