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MCP2515
REGISTER 4-7:
RXBnEID0 – RECEIVE BUFFER n EXTENDED IDENTIFIER LOW
(ADDRESS: 64h, 74h)
R-x
EID7
R-x
EID6
R-x
EID5
R-x
EID4
R-x
EID3
R-x
EID2
R-x
EID1
R-x
EID0
bit 7
Legend:
bit 0
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
RTR
R-x
RB1
R-x
RB0
R-x
DLC3
R-x
DLC2
R-x
DLC1
R-x
DLC0
bit 7
Legend:
bit 0
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
bit 6
bit 5
bit 4
bit 3-0
Unimplemented: Reads as ‘ 0 ’
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
RB1: Reserved Bit 1
RB0: Reserved Bit 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
RBnD7
R-x
RBnD6
R-x
RBnD5
R-x
RBnD4
R-x
RBnD3
R-x
RBnD2
R-x
RBnD1
R-x
RBnD0
bit 7
Legend:
bit 0
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
? 2003-2012 Microchip Technology Inc.
DS21801G-page 31
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