Datasheet

 2003-2012 Microchip Technology Inc. DS21801G-page 31
MCP2515
REGISTER 4-7: RXBnEID0 – RECEIVE BUFFER n EXTENDED IDENTIFIER LOW
(ADDRESS: 64h, 74h)
R-x R-x R-x R-x R-x R-x R-x R-x
EID7 EID6 EID5 EID4 EID3 EID2 EID1 EID0
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<7:0>: Extended Identifier bits
These bits hold the Least Significant eight bits of the Extended Identifier for the received message
REGISTER 4-8: RXBnDLC – RECEIVE BUFFER n DATA LENGTH CODE
(ADDRESS: 65h, 75h)
R-x R-x R-x R-x R-x R-x R-x R-x
— RTR RB1 RB0 DLC3 DLC2 DLC1 DLC0
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 Unimplemented: Reads as ‘0’
bit 6 RTR: Extended Frame Remote Transmission Request bit
(valid only when RXBnSIDL.IDE = 1)
1 = Extended Frame Remote Transmit Request Received
0 = Extended Data Frame Received
bit 5 RB1: Reserved Bit 1
bit 4 RB0: Reserved Bit 0
bit 3-0 DLC<3:0>: Data Length Code bits
Indicates number of data bytes that were received
REGISTER 4-9: RXBnDM – RECEIVE BUFFER n DATA BYTE M
(ADDRESS: 66h - 6Dh, 76h - 7Dh)
R-x R-x R-x R-x R-x R-x R-x R-x
RBnD7 RBnD6 RBnD5 RBnD4 RBnD3 RBnD2 RBnD1 RBnD0
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 RBnD7:RBnD0: Receive Buffer n Data Field Bytes m
Eight bytes containing the data bytes for the received message