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| 型號(hào)： | MCP2510T-E/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP18 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件頁(yè)數(shù)： | 33/76頁(yè) |
| 文件大?。?/td> | 1076K |
| 代理商： | MCP2510T-E/P |
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1999 Microchip Technology Inc.
Preliminary
DS21291C-page 39
MCP2510
5.10
Bit Timing Configuration Registers
The configuration registers (CNF1, CNF2, CNF3) con-
trol the bit timing for the CAN bus interface. These reg-
isters can only be modified when the MCP2510 is in
configuration mode (see Section 9.0).
5.10.1
CNF1
The BRP<5:0> bits control the baud rate prescaler.
These bits set the length of TQ relative to the OSC1
input frequency, with the minimum length of TQ being 2
OSC1 clock cycles in length (when BRP<5:0> are set
to 000000). The SJW<1:0> bits select the synchroniza-
tion jump width in terms of number of TQ’s.
5.10.2
CNF2
The PRSEG<2:0> bits set the length, in TQ’s, of the
propagation segment. The PHSEG1<2:0> bits set the
length, in TQ’s, of phase segment 1. The SAM bit con-
trols how many times the RXCAN pin is sampled. Set-
ting this bit to a ‘1’ causes the bus to be sampled three
times; twice at TQ/2 before the sample point, and once
at the normal sample point (which is at the end of
phase segment 1). The value of the bus is determined
to be the value read during at least two of the samples.
If the SAM bit is set to a ‘0’ then the RXCAN pin is sam-
pled only once at the sample point. The BTLMODE bit
controls how the length of phase segment 2 is deter-
mined. If this bit is set to a ‘1’ then the length of phase
segment 2 is determined by the PHSEG2<2:0> bits of
CNF3 (see Section 5.10.3). If the BTLMODE bit is set
to a ‘0’ then the length of phase segment 2 is the
greater of phase segment 1 and the information pro-
cessing time (which is fixed at 2 TQ for the MCP2510).
5.10.3
CNF3
The PHSEG2<2:0> bits set the length, in TQ’s, of
Phase Segment 2, if the CNF2.BTLMODE bit is set to
a ‘1’. If the BTLMODE bit is set to a ‘0’ then the
PHSEG2<2:0> bits have no effect.
REGISTER 5-1:
CNF1 - Configuration Register1 (ADDRESS: 2Ah)
R/W-0
SJW1
SJW0
BRP5
BRP4
BRP3
BRP2
BRP1
BRP0
R = Readable bit
W = Writable bit
C = Bit can be cleared by
MCU but not set
U = Unimplemented -
reads as ‘0’
- n = Value at POR reset
bit 7
bit 0
bit 7-6:
SJW<1:0>: Synchronization Jump Width Length
11 = Length = 4 x TQ
10 = Length = 3 x TQ
01 = Length = 2 x TQ
00 = Length = 1 x TQ
bit 5-0: BRP<5:0>: Baud Rate Prescaler
111111 = TQ = 2 x 64 x 1/FOSC
-
000000 = TQ = 2 x 1 x 1/FOSC
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| MCP2510T-I/SO | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Stand-alone CAN RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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