32172 Datasheet, PDF (577/875 Pages) Renesas Technology Corp – 32-bit RISC Single-chip Microcomputers

13
CAN MODULES
13.2 CAN Module Related Registers
Three mask registers are used in acceptance filtering: Global Mask Register, Local Mask Register
A, and Local Mask Register B.
The Global Mask Register is used for message slots 0-13, while the Local Mask Registers A and B
respectively are used for slots 14 and 15.
• When any bit in this register is set to 0, the corresponding ID bit is masked during acceptance
filtering (so that the ID is assumed to have matched).
• When any bit in this register is set to 1, the corresponding ID bit is compared with the received
ID during acceptance filtering. If it matches the ID set for the message slot, the received data
is stored in that slot.
Note 1: SID0M corresponds to the MSB of the standard ID.
Note 2: The Global Mask Register can only be modified when none of the slots 0-13 has
receive requests set.
Note 3: The Local Mask Register A can only be modified when slot 14 does not have receive
requests set.
Note 4: The Local Mask Register B can only be modified when slot 15 does not have receive
requests set.
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