Datasheet

© 2007 Microchip Technology Inc. Preliminary DS39625C-page 305
PIC18F2585/2680/4585/4680
REGISTER 23-45: RXFCONn: RECEIVE FILTER CONTROL REGISTER n [0 ≤ n ≤ 1]
(1)
REGISTER 23-46: SDFLC: STANDARD DATA BYTES FILTER LENGTH COUNT REGISTER
(1)
RXFCON0
R/W-0 R/W-0 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1
RXF7EN RXF6EN RXF5EN RXF4EN RXF3EN RXF2EN RXF1EN RXF0EN
RXFCON1
R/W-0 R/W-0 R/W-0 R/W-1 R/W-0 R/W-0 R/W-0 R/W-0
RXF15EN RXF14EN RXF13EN RXF12EN RXF11EN RXF10EN RXF9EN RXF8EN
bit 7 bit 0
bit 7-0 RXFnEN: Receive Filter n Enable bits
0 = Filter is disabled
1 = Filter is enabled
Note 1: This register is available in Mode 1 and 2 only.
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
Note: Registers 23-46 through 23-51are writable
in Configuration mode only.
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — FLC4FLC3FLC2FLC1FLC0
bit 7 bit 0
bit 7-5 Unimplemented: Read as ‘0’
bit 4-0 FLC4:FLC0: Filter Length Count bits
Mode 0:
Not used; forced to ‘00000’.
00000-10010 = 0 18 bits are available for standard data byte filter. Actual number of bits
used depends on DLC3:DLC0 bits (RXBnDLC<3:0> or BnDLC<3:0> if
configured as RX buffer) of message being received.
If DLC3:DLC0 = 0000 No bits will be compared with incoming data bits
If DLC3:DLC0 = 0001 Up to 8 data bits of RXFnEID<7:0>, as determined by FLC2:FLC0, will
be compared with the corresponding number of data bits of the
incoming message
If DLC3:DLC0 = 0010 Up to 16 data bits of RXFnEID<15:0>, as determined by FLC3:FLC0,
will be compared with the corresponding number of data bits of the
incoming message
If DLC3:DLC0 = 0011 Up to 18 data bits of RXFnEID<17:0>, as determined by FLC4:FLC0,
will be compared with the corresponding number of data bits of the
incoming message
Note 1: This register is available in Mode 1 and 2 only.
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