Datasheet

 2003-2013 Microchip Technology Inc. DS30491D-page 291
PIC18F6585/8585/6680/8680
23.2.3 DEDICATED CAN RECEIVE
BUFFER REGISTERS
This section shows the dedicated CAN Receive Buffer
registers with their associated control registers.
REGISTER 23-13: RXB0CON: RECEIVE BUFFER 0 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 RXM1 RXM0
— RXRTRRO RXB0DBEN JTOFF FILHIT0
Mode 1, 2
R/C-0 R/W-0 R-0 R-0 R-0 R-0 R-0 R-0
RXFUL RXM1 RTRRO FILHIT4 FILHIT3 FILHIT2 FILHIT1 FILHIT0
bit 7 bit 0
bit 7 RXFUL: Receive Full Status bit
1 = Receive buffer contains a received message
0 = Receive buffer is open to receive a new message
Note: 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.
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>.
Legend: U = Unimplemented bit, read as ‘0’ - n = Value at POR
C = Clearable bit R = Readable bit W = Writable bit x = Bit is unknown
‘1’ = Bit is set ‘0’ = Bit is cleared
18F8680.book Page 291 Tuesday, January 29, 2013 1:32 PM