參數(shù)資料
型號(hào)： MCP2515-I/ST
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDSO20
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 26/88頁(yè)
文件大?。?/td> 1205K
代理商： MCP2515-I/ST
MCP2515
DS21801F-page 32
2010 Microchip Technology Inc.
4.5
Message Acceptance Filters and
Masks
The message acceptance filters and masks are used to
determine if a message in the message assembly buf-
fer should be loaded into either of the receive buffers
(see Figure 4-5). Once a valid message has been
received into the MAB, the identifier fields of the mes-
sage are compared to the filter values. If there is a
match, that message will be loaded into the appropriate
receive buffer.
4.5.1
DATA BYTE FILTERING
When receiving standard data frames (11-bit identifier),
the MCP2515 automatically applies 16 bits of masks
and
filters
normally
associated
with
extended
identifiers to the first 16 bits of the data field (data bytes
0 and 1). Figure 4-4 illustrates how masks and filters
apply to extended and standard data frames.
Data byte filtering reduces the load on the MCU when
implementing Higher Layer Protocols (HLPs) that filter
on the first data byte (e.g., DeviceNet).
4.5.2
FILTER MATCHING
The filter masks (see Register 4-14 through Register 4-
17) are used to determine which bits in the identifier are
examined with the filters. A truth table is shown in
Table 4-2 that indicates how each bit in the identifier is
compared to the masks and filters to determine if the
message should be loaded into a receive buffer. The
mask essentially determines which bits to apply the
acceptance filters to. If any mask bit is set to a zero,
that bit will automatically be accepted, regardless of the
filter bit.
TABLE 4-2:
FILTER/MASK TRUTH TABLE
As shown in the receive buffers block diagram
(Figure 4-2), acceptance filters RXF0 and RXF1 (and
filter mask RXM0) are associated with RXB0. Filters
RXF2, RXF3, RXF4, RXF5 and mask RXM1 are
associated with RXB1.
FIGURE 4-4:
MASKS AND FILTERS APPLY TO CAN FRAMES
Mask Bit n
Filter Bit n
Message
Identifier
bit
Accept or
Reject bit n
0X
X
Accept
10
0
Accept
10
1
Reject
11
0
Reject
11
1
Accept
Note:
X
= don’t care
Extended Frame
Standard Data Frame
ID10
ID0 EID17
EID0
Masks and Filters apply to the entire 29-bit ID field
ID10
ID0
Data Byte 0
Data Byte 1
11-bit ID Standard frame
*
16-bit data filtering *
* The two MSb (EID17 and EID16) mask and filter bits are not used.
相關(guān)PDF資料
PDF描述
MCP2515-E/P 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP18
MCP2515T-I/ST 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDSO20
MCP79400-I/MNY REAL TIME CLOCK, PDSO8
MCP79400T-I/ST REAL TIME CLOCK, PDSO8
MCP79402-I/MS REAL TIME CLOCK, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP2515T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface
MCP2515T-E/ML 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CAN controller with SPI interface 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
MCP2515T-E/SO 功能描述:網(wǎng)絡(luò)控制器與處理器 IC W/ SPI Inter 125dC 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
MCP2515T-E/ST 功能描述:網(wǎng)絡(luò)控制器與處理器 IC W/ SPI Inter 125dC 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
MCP2515T-I/M 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*