Datasheet

MCP2515
DS21801E-page 30 © 2007 Microchip Technology Inc.
REGISTER 4-5: RXBnSIDL – RECEIVE BUFFER n STANDARD IDENTIFIER LOW
(ADDRESS: 62h, 72h)
R-x R-x R-x R-x R-x U-0 R-x R-x
SID2 SID1 SID0 SRR IDE
—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: Standard Identifier bits <2:0>
These bits contain the three least significant bits of the Standard Identifier for the received message
bit 4 SRR: Standard Frame Remote Transmit Request bit (valid only if IDE bit = ‘0’)
1 = Standard Frame Remote Transmit Request Received
0 = Standard Data Frame Received
bit 3 IDE: Extended Identifier Flag bit
This bit indicates whether the received message was a Standard or an Extended Frame
1 = Received message was an Extended Frame
0 = Received message was a Standard Frame
bit 2 Unimplemented: Reads as ‘0’
bit 1-0 EID: Extended Identifier bits <17:16>
These bits contain the two most significant bits of the Extended Identifier for the received message
REGISTER 4-6: RXBnEID8 – RECEIVE BUFFER n EXTENDED IDENTIFIER HIGH
(ADDRESS: 63h, 73h)
R-x R-x R-x R-x R-x R-x R-x R-x
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: Extended Identifier bits <15:8>
These bits hold bits 15 through 8 of the Extended Identifier for the received message