Datasheet

MCP2515
DS20001801J-page 32 2003-2019 Microchip Technology Inc.
REGISTER 4-8: RXBnDLC: RECEIVE BUFFER n DATA LENGTH CODE REGISTER
(ADDRESS: 65h, 75h)
U-0 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: Read as ‘0
bit 6 RTR: Extended Frame Remote Transmission Request bit (valid only when IDE (RXBnSIDL[3]) = 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 the number of data bytes that were received.
REGISTER 4-9: RXBnDm: RECEIVE BUFFER n DATA BYTE m REGISTER
(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 RBnD[7:0]: Receive Buffer n Data Field Bytes m bits
Eight bytes containing the data bytes for the received message.