Datasheet
PIC18F2682/2685/4682/4685
DS39761C-page 292 © 2009 Microchip Technology Inc.
REGISTER 23-14: RXB1CON: RECEIVE BUFFER 1 CONTROL REGISTER
Mode 0
R/C-0 R/W-0 R/W-0 U-0 R-0 R/W-0 R-0 R-0
RXFUL
(1)
RXM1 RXM0 — RXRTRRO FILHIT2 FILHIT1 FILHIT0
Mode 1,2
R/C-0 R/W-0 R-0 R-0 R-0 R-0 R-0 R-0
RXFUL
(1)
RXM1 RTRRO FILHIT4 FILHIT3 FILHIT2 FILHIT1 FILHIT0
bit 7 bit 0
Legend: C = Clearable bit
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 RXFUL: Receive Full Status bit
(1)
1 = Receive buffer contains a received message
0 = Receive buffer is open to receive a new message
bit 6
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 Mode 0:
Unimplemented: Read as ‘0’
Mode 1, 2:
FILHIT4: Filter Hit bit 4
This bit combines with other bits to form filter acceptance bits <4:0>.
bit 3 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 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.