Datasheet

 2003-2019 Microchip Technology Inc. DS20001801J-page 27
MCP2515
REGISTER 4-1: RXB0CTRL: RECEIVE BUFFER 0 CONTROL REGISTER (ADDRESS: 60h)
U-0 R/W-0 R/W-0 U-0 R-0 R/W-0 R-0 R-0
— RXM1 RXM0 — RXRTR BUKT BUKT1 FILHIT0
(1)
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;
Extended ID Filter registers, RXFnEID8:RXFnEID0, are applied to the first two bytes of data in
the messages with standard IDs
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 BUKT: Rollover Enable bit
1 = RXB0 message will roll over and be written to RXB1 if RXB0 is full
0 = Rollover is disabled
bit 1 BUKT1: Read-Only Copy of BUKT bit (used internally by the MCP2515)
bit 0 FILHIT0: Filter Hit bit (indicates which acceptance filter enabled reception of message)
(1)
1 = Acceptance Filter 1 (RXF1)
0 = Acceptance Filter 0 (RXF0)
Note 1: If a rollover from RXB0 to RXB1 occurs, the FILHIT0 bit will reflect the filter that accepted the message
that rolled over.