
MCP2515
DS21801F-page 42
2010 Microchip Technology Inc.
REGISTER 5-1:
CNF1 – CONFIGURATION 1 (ADDRESS: 2Ah)
R/W-0
SJW1
SJW0
BRP5
BRP4
BRP3
BRP2
BRP1
BRP0
bit 7
bit 0
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
bit 7-6
SJW: Synchronization Jump Width Length bits <1:0>
11
= Length = 4 x TQ
10
= Length = 3 x TQ
01
= Length = 2 x TQ
00
= Length = 1 x TQ
bit 5-0
BRP: Baud Rate Prescaler bits <5:0>
TQ = 2 x (BRP + 1)/FOSC
REGISTER 5-2:
CNF2 – CONFIGURATION 1 (ADDRESS: 29h)
R/W-0
BTLMODE
SAM
PHSEG12
PHSEG11
PHSEG10
PRSEG2
PRSEG1
PRSEG0
bit 7
bit 0
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
bit 7
BTLMODE: PS2 Bit Time Length bit
1
= Length of PS2 determined by PHSEG22:PHSEG20 bits of CNF3
0
= Length of PS2 is the greater of PS1 and IPT (2 TQ)
bit 6
SAM: Sample Point Configuration bit
1
= Bus line is sampled three times at the sample point
0
= Bus line is sampled once at the sample point
bit 5-3
PHSEG1: PS1 Length bits<2:0>
(PHSEG1 + 1) x TQ
bit 2-0
PRSEG: Propagation Segment Length bits <2:0>
(PRSEG + 1) x TQ