70353C Datasheet, PDF (13/76 Pages) Microchip Technology – Section 21. Enhanced Controller Area Network

Section 21. Enhanced Controller Area Network (ECAN™)
Register 21-3:
R/W-1
bit 15
CiFEN1: ECAN Acceptance Filter Enable Register
R/W-1
R/W-1
R/W-1
R/W-1
FLTEN<15:8>
R/W-1
R/W-1
R/W-1
bit 8
R/W-1
bit 7
R/W-1
R/W-1
R/W-1
R/W-1
FLTEN<7:0>
R/W-1
R/W-1
R/W-1
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-0
FLTENn: Enable Filter n bits (n = 0-15)
1 = Enable filter n to accept messages
0 = Disable filter n
Register 21-4:
R/W-x
SID10
bit 15
CiRXFnSID: ECAN Acceptance Filter Standard Identifier Register n (n = 0-15)
R/W-x
SID9
R/W-x
SID8
R/W-x
SID7
R/W-x
SID6
R/W-x
SID5
R/W-x
SID4
R/W-x
SID3
bit 8
R/W-x
SID2
bit 7
R/W-x
SID1
R/W-x
SID0
U-0
R/W-x
U-0
—
EXIDE⁽¹⁾
—
R/W-x
EID17
R/W-x
EID16
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-5
bit 4
bit 3
bit 2
bit 1-0
SID<10:0>: Standard Identifier bits
1 = Message address bit, SIDx, must be ‘1’ to match filter
0 = Message address bit, SIDx, must be ‘0’ to match filter
Unimplemented: Read as ‘0’
EXIDE: Extended Identifier Enable bit⁽¹⁾
If MIDE = 1:
1 = Match only messages with extended identifier addresses
0 = Match only messages with standard identifier addresses
If MIDE = 0:
Ignore EXIDE bit.
Unimplemented: Read as ‘0’
EID<17:16>: Extended Identifier bits
1 = Message address bit, EIDx, must be ‘1’ to match filter
0 = Message address bit, EIDx, must be ‘0’ to match filter
Note 1: If no mask is applied to a filter, the following occurs: The filter accepts only standard frames. The filter
does not accept extended frames even if the EXIDE bit is set to ‘1’.
21
© 2008-2011 Microchip Technology Inc.
DS70353C-page 21-13