
MCP2515
DS21801F-page 28
2010 Microchip Technology Inc.
REGISTER 4-2:
RXB1CTRL – RECEIVE BUFFER 1 CONTROL
(ADDRESS: 70h)
U-0
R/W-0
U-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: Receive Buffer Operating Mode bits
11
= Turn mask/filters off; receive any message
10
= Receive only valid messages with extended identifiers that meet filter criteria
01
= Receive only valid messages with standard identifiers that meet filter criteria
00
= Receive 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: 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 BUKT bit set in RXB0CTRL)
000
=
Acceptance Filter 0 (RXF0) (Only if BUKT bit set in RXB0CTRL)