Datasheet

MCP2515
DS20001801J-page 28  2003-2019 Microchip Technology Inc.
REGISTER 4-2: RXB1CTRL: RECEIVE BUFFER 1 CONTROL REGISTER (ADDRESS: 70h)
U-0 R/W-0 R/W-0 U-0 R-0 R-0 R-0 R-0
— RXM1 RXM0 — RXRTR FILHIT2 FILHIT1 FILHIT0
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 6-5 RXM[1:0]: Receive Buffer Operating mode bits
11 = Turns mask/filters off; receives any message
10 = Reserved
01 = Reserved
00 = Receives all valid messages using either Standard or Extended Identifiers that meet filter criteria
bit 4 Unimplemented: Read as ‘0’
bit 3 RXRTR: Received Remote Transfer Request bit
1 = Remote Transfer Request received
0 = No Remote Transfer Request received
bit 2-0 FILHIT[2:0]: Filter Hit bits (indicates which acceptance filter enabled reception of message)
101 = Acceptance Filter 5 (RXF5)
100 = Acceptance Filter 4 (RXF4)
011 = Acceptance Filter 3 (RXF3)
010 = Acceptance Filter 2 (RXF2)
001 = Acceptance Filter 1 (RXF1) (only if the BUKT bit is set in RXB0CTRL)
000 = Acceptance Filter 0 (RXF0) (only if the BUKT bit is set in RXB0CTRL)