Datasheet

MCP2515

(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

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 BUKT: Rollover Enable bit

1 = RXB0 message will rollover and be written to RXB1 if RXB0 is full

0 = Rollover disabled

bit 1 BUKT1: Read-only Copy of BUKT bit (used internally by the MCP2515)

bit 0 FILHIT: Filter Hit bit - indicates which acceptance filter enabled reception of message

1 = Acceptance Filter 1 (RXF1)

0 = Acceptance Filter 0 (RXF0)

Note: If a rollover from RXB0 to RXB1 occurs, the FILHIT bit will reflect the filter that accepted

the message that rolled over.