MCP2515
REGISTER 4-1:
RXB0CTRL – RECEIVE BUFFER 0 CONTROL
(ADDRESS: 60h)
U-0
—
R/W-0
RXM1
R/W-0
RXM0
U-0
—
R-0
R/W-0
BUKT
R-0
R-0
RXRTR
BUKT1
FILHIT0
bit 7
bit 0
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
bit 3
Unimplemented: Read as ‘0’
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
bit 0
BUKT1: Read-only Copy of BUKT bit (used internally by the MCP2515)
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.
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
‘1’ = Bit is set
© 2005 Microchip Technology Inc.
Preliminary
DS21801D-page 27
MICROCHIP [ MICROCHIP ]
