Datasheet

© 2006 Microchip Technology Inc. DS41159E-page 215
PIC18FXX8
19.2.3.1 Message Acceptance Filters and
Masks
This subsection describes the message acceptance
filters and masks for the CAN receive buffers.
REGISTER 19-21: RXFnSIDH: RECEIVE ACCEPTANCE FILTER n STANDARD IDENTIFIER FILTER,
HIGH BYTE REGISTERS
REGISTER 19-22: RXFnSIDL: RECEIVE ACCEPTANCE FILTER n STANDARD IDENTIFIER FILTER,
LOW BYTE REGISTERS
R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x R/W-x
SID10 SID9 SID8 SID7 SID6 SID5 SID4 SID3
bit 7 bit 0
bit 7-0 SID10:SID3: Standard Identifier Filter bits if EXIDEN = 0 or
Extended Identifier Filter bits EID28:EID21 if EXIDEN = 1
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
R/W-x R/W-x R/W-x U-0 R/W-x U-0 R/W-x R/W-x
SID2 SID1 SID0
— EXIDEN —EID17EID16
bit 7 bit 0
bit 7-5 SID2:SID0: Standard Identifier Filter bits if EXIDEN = 0 or
Extended Identifier Filter bits EID20:EID18 if EXIDEN = 1
bit 4 Unimplemented: Read as ‘0’
bit 3 EXIDEN: Extended Identifier Filter Enable bit
1 = Filter will only accept extended ID messages
0 = Filter will only accept standard ID messages
bit 2 Unimplemented: Read as ‘0’
bit 1-0 EID17:EID16: Extended Identifier Filter bits
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