MCP25050-I Datasheet, PDF (10/66 Pages) Microchip Technology – CAN I/O Expander Family

MCP2502X/5X
REGISTER 2-4: CNF2 - CAN CONFIGURATION REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
BTLMODE SAM PHSEG12 PHSEG11 PHSEG10
bit 7
R/W-0
PRSEG2
R/W-0
PRSEG1
R/W-0
PRSEG0
bit 0
bit 7
bit 6
bit 5-3
bit 2-0
BTL MODE: Length determination of PHSEG2 bit
1 = Length of Phase_Seg2 determined by bits 2:0 of CNF3
0 = Length of Phase_Seg2 is the greater of Phase_Seg1 or IPT(2Tq)
SAM: Sample of the CAN bus line bit
1 = Bus line is sampled three times at the sample point
0 = Bus line is sampled once at the sample point
PHSEG12:PHSEG10: Phase Buffer Segment1 bits
111 = length = 8 x TQ
-
-
-
000 = length = 1 x TQ
PRSEG2:PRSEG0: Propagation Time Segment bits
111 = length = 8 x TQ
-
-
-
000 = length = 1 x TΘ
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
REGISTER 2-5: CNF3 - CAN CONFIGURATION REGISTER 3
U-0
R/W-0
U-0
U-0
U-0
—
WAKFIL
—
—
—
bit 7
R/W-0
PHSEG22
R/W-0
PHSEG21
R/W-0
PHSEG20
bit 0
bit 7
bit 6
bit 5-3
bit 2-0
Unimplemented: (Reads as 0)
WAKFIL: Wake-up filter bit
1 = Wake-up filter enabled
0 = Wake-up filter disabled
Unimplemented: (Reads as 0)
PHSEG22:PHSEG20: Phase Buffer Segment2 bits
111 = length = 8 x TQ
-
-
-
001 = length = 2 x TQ
000 = Invalid
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
DS21664D-page 10
© 2007 Microchip Technology Inc.