Datasheet

MCP2515
DS20001801J-page 30  2003-2019 Microchip Technology Inc.
REGISTER 4-4: RXBnSIDH: RECEIVE BUFFER n STANDARD IDENTIFIER REGISTER HIGH
(ADDRESS: 61h, 71h)
R-x R-x R-x R-x R-x R-x R-x R-x
SID10 SID9 SID8 SID7 SID6 SID5 SID4 SID3
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 SID[10:3]: Standard Identifier bits
These bits contain the eight Most Significant bits of the Standard Identifier for the received message.
REGISTER 4-5: RXBnSIDL: RECEIVE BUFFER n STANDARD IDENTIFIER REGISTER 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
— EID17 EID16
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 bits
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: Read as ‘0’
bit 1-0 EID[17:16]: Extended Identifier bits
These bits contain the two Most Significant bits of the Extended Identifier for the received message.