PIC18F2480/2580/4480/4580
REGISTER 24-14: RXB1CON: RECEIVE BUFFER 1 CONTROL REGISTER
R/C-0
RXFUL(1)
R/W-0
RXM1
R/W-0
RXM0
U-0
—
R-0
R/W-0
R-0
R-0
Mode 0
RXRTRRO
FILHIT2
FILHIT1
FILHIT0
R/C-0
RXFUL(1)
R/W-0
RXM1
R-0
R-0
R-0
R-0
R-0
R-0
Mode 1,2
RTRRO
FILHIT4
FILHIT3
FILHIT2
FILHIT1
FILHIT0
bit 7
bit 0
Legend:
C = Clearable bit
W = Writable bit
‘1’ = Bit is set
R = Readable bit
-n = Value at POR
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
bit 7
bit 6
RXFUL: Receive Full Status bit(1)
1= Receive buffer contains a received message
0= Receive buffer is open to receive a new message
Mode 0:
RXM1: Receive Buffer Mode bit 1 (combines with RXM0 to form RXM<1:0> bits, see bit 5)
11= Receive all messages (including those with errors); filter criteria is ignored
10= Receive only valid messages with extended identifier; EXIDEN in RXFnSIDL must be ‘1’
01= Receive only valid messages with standard identifier, EXIDEN in RXFnSIDL must be ‘0’
00= Receive all valid messages as per EXIDEN bit in RXFnSIDL register
Mode 1, 2:
RXM1: Receive Buffer Mode bit
1= Receive all messages (including those with errors); acceptance filters are ignored
0= Receive all valid messages as per acceptance filters
bit 5
Mode 0:
RXM0: Receive Buffer Mode bit 0 (combines with RXM1 to form RXM<1:0> bits, see bit 6)
Mode 1, 2:
RTRRO: Remote Transmission Request bit for Received Message (read-only)
1= A remote transmission request is received
0= A remote transmission request is not received
bit 4
bit 3
Mode 0:
Unimplemented: Read as ‘0’
Mode 1, 2:
FILHIT4: Filter Hit bit 4
This bit combines with other bits to form the filter acceptance bits<4:0>.
Mode 0:
RXRTRRO: Remote Transmission Request bit for Received Message (read-only)
1= A remote transmission request is received
0= A remote transmission request is not received
Mode 1, 2:
FILHIT3: Filter Hit bit 3
This bit combines with other bits to form the filter acceptance bits<4:0>.
Note 1: This bit is set by the CAN module upon receiving a message and must be cleared by software after the
buffer is read. As long as RXFUL is set, no new message will be loaded and buffer will be considered full.
© 2009 Microchip Technology Inc.
DS39637D-page 295
MICROCHIP [ MICROCHIP ]
