Datasheet

MCP2515
DS21801G-page 36  2003-2012 Microchip Technology Inc.
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REGISTER 4-15: RXMnSIDL – MASK n STANDARD IDENTIFIER LOW
(ADDRESS: 21h, 25h)
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 R/W-0 R/W-0
SID2 SID1 SID0 — — —EID17EID16
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-5 SID<2:0>: Standard Identifier Mask bits
These bits hold the mask bits to be applied to bits<2:0> of the Standard Identifier portion of a received
message
bit 4-2 Unimplemented: Reads as ‘0’
bit 1-0 EID<17:16>: Extended Identifier Mask bits
These bits hold the mask bits to be applied to bits <17:16> of the Extended Identifier portion of a
received message
Note: The mask and filter registers read all '0' when in any mode except Configuration mode.
REGISTER 4-16: RXMnEID8 – MASK n EXTENDED IDENTIFIER HIGH
(ADDRESS: 22h, 26h)
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
EID15 EID14 EID13 EID12 EID11 EID10 EID9 EID8
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-0 EID<15:8>: Extended Identifier bits
These bits hold the filter bits to be applied to bits <15:8> of the Extended Identifier portion of a received
message. If corresponding RXM = 00 and EXIDE = 0, these bits are applied to byte 0 in received data
Note: The mask and filter registers read all '0' when in any mode except Configuration mode.