MCP2515-ESLASHML datasheet(27/92 Pages) MICROCHIP

27 / 92 page

 2003-2012 Microchip Technology Inc.

DS21801G-page 27

MCP2515

RXB0CTRL – RECEIVE BUFFER 0 CONTROL

(ADDRESS: 60h)

U-0

R/W-0

U-0

R-0

R/W-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<1:0>: Receive Buffer Operating mode bits

= Turn mask/filters off; receive any message

= Receive only valid messages with extended identifiers that meet filter criteria

= Receive only valid messages with standard identifiers that meet filter criteria. Extended ID filter

registers RXFnEID8:RXFnEID0 are ignored for the messages with standard IDs.

= Receive all valid messages using either standard or extended identifiers that meet filter criteria.

Extended ID filter registers RXFnEID8:RXFnEID0 are applied to 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

= Remote Transfer Request Received

= No Remote Transfer Request Received

bit 2

BUKT: Rollover Enable bit

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

= Rollover 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

= Acceptance Filter 1 (RXF1)

= 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.

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