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參數(shù)資料
| 型號(hào)： | SJA1000 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Stand-alone CAN controller(單機(jī)CAN控制器) |
| 中文描述： | 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 18/68頁(yè) |
| 文件大?。?/td> | 234K |
| 代理商： | SJA1000 |
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2000 Jan 04
18
Philips Semiconductors
Product specification
Stand-alone CAN controller
SJA1000
6.3.7
T
RANSMIT BUFFER LAYOUT
The global layout of the transmit buffer is shown in Table 7. The buffer serves to store a message from the microcontroller
to be transmitted by the SJA1000. It is subdivided into a descriptor and data field. The transmit buffer can be written to
and read out by the microcontroller in operating mode only. In reset mode a ‘FFH’ is reflected for all bytes.
Table 7
Layout of transmit buffer
CAN
ADDRESS
FIELD
NAME
BITS
7
6
5
4
3
2
1
0
10
11
12
13
14
15
16
17
18
19
descriptor
identifier byte 1
identifier byte 2
TX data 1
TX data 2
TX data 3
TX data 4
TX data 5
TX data 6
TX data 7
TX data 8
ID.10
ID.2
transmit data byte 1
transmit data byte 2
transmit data byte 3
transmit data byte 4
transmit data byte 5
transmit data byte 6
transmit data byte 7
transmit data byte 8
ID.9
ID.1
ID.8
ID.0
ID.7
RTR
ID.6
DLC.3
ID.5
DLC.2
ID.4
DLC.1
ID.3
DLC.0
data
6.3.7.1
Identifier (ID)
The identifier consists of 11 bits (ID.10 to ID.0). ID.10 is
the most significant bit, which is transmitted first on the bus
during the arbitration process. The identifier acts as the
message’s name. It is used in a receiver for acceptance
filtering and also determining the bus access priority
during the arbitration process. The lower the binary value
of the identifier the higher the priority. This is due to a
larger number of leading dominant bits during arbitration.
6.3.7.2
Remote Transmission Request (RTR)
If this bit is set, a remote frame will be transmitted via the
bus. This means that no data bytes are included within this
frame. Nevertheless, it is necessary to specify the correct
data length code which depends on the corresponding
data frame with the same identifier coding.
If the RTR bit is not set, a data frame will be sent including
the number of data bytes as specified by the data length
code.
6.3.7.3
Data Length Code (DLC)
The number of bytes in the data field of a message is
coded by the data length code. At the start of a remote
frame transmission the data length code is not considered
due to the RTR bit being at logic 1 (remote). This forces
the number of transmitted/received data bytes to be
logic 0. Nevertheless, the data length code must be
specified correctly to avoid bus errors if two
CAN controllersstartaremoteframetransmissionwiththe
same identifier simultaneously.
The range of the data byte count is 0 to 8 bytes and is
coded as follows:
DataByteCount = 8
×
DLC.3 + 4
×
DLC.2 + 2
×
DLC.1 +
DLC.0
For reasons of compatibility no data length code >8 should
be used. If a value >8 is selected, 8 bytes are transmitted
in the data frame with the data length code specified in
DLC.
6.3.7.4
Data field
The number of transferred data bytes is determined by the
data length code. The first bit transmitted is the most
significant bit of data byte 1 at address 12.
6.3.8
R
ECEIVE BUFFER
The global layout of the receive buffer is very similar to the
transmit buffer described in Section 6.3.7. The receive
buffer is the accessible part of the RXFIFO and is located
in the range between CAN address 20 and 29.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SJA1000/N1,112 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC STAND-ALONE CAN CONTROLLER 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 |
| SJA1000/N1112 | 制造商:NXP Semiconductors 功能描述:IC CAN CONTROLLER 1000 DIP28 |
| SJA1000N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Stand-alone CAN controller |
| SJA1000T | 制造商:NXP Semiconductors 功能描述: |
| SJA1000T/N,112 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC STAND ALONE CAN CONTROLLER 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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