- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371053 > MC68HC705V8 (Motorola, Inc.) 8-Bit Microcontroller Units (MCU).(8位微控制器) PDF資料下載
參數(shù)資料
| 型號： | MC68HC705V8 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 3/28頁 |
| 文件大?。?/td> | 220K |
| 代理商： | MC68HC705V8 |
第1頁第2頁當前第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
AN1224/D
MOTOROLA
3
Frame Headers and Addressing
As outlined above, a J1850 frame can contain one of three types of headers, depending upon a particular
system's requirements. The single-byte header incorporates the frame priority/type and target address into
a single byte. A one-byte consolidated header also consolidates the frame priority/type and target address
into a single byte, with bit 4 = 1 to indicate that it is a one-byte consolidated header. The three-byte header
places the frame priority/type into the first byte, the target address of the intended receiver(s) into the
second byte, and the source address of the frame originator into the third byte. In the priority/type byte of
the three-byte header, bit 4 = 0 to indicate it is a three-byte header.
Frames transmitted on a J1850 network can be either physically or functionally addressed. Since every
node on a J1850 network must be assigned a unique physical address, a frame can be addressed directly
to any particular node by making that node's physical address the target address of the frame. This is
useful in applications such as diagnostic requests, where a specific node's identification may be important.
Functional addressing is used when the data being transmitted can be identified by its particular function,
rather than its intended receiver(s). With this form of addressing, a frame containing data is transmitted
with the function of that data encoded in the header of the frame. All nodes which require the data of that
function can then receive it at the same time. This is of particular importance to networks where the
physical address of the intended receivers is not known, or could change, while their function remains the
same. An example of data that would be functionally addressed is wheel speed, which could be of interest
to multiple receivers, each with a different physical address. Functionally addressing the wheel speed data
would allow it to be transmitted to all intended receivers in a single frame, instead of transmitting the data in
a separate frame for each receiver.
Error Detection
Every frame transmitted onto a J1850 network contains a single CRC byte for error detection. This byte is
usually produced by shifting the header and data bytes through a preset series of feedback shift registers.
The resulting byte is then inserted in the frame following the data bytes. Any node which receives the frame
then shifts the header, data and CRC bytes through an identical series of feedback shift registers, with an
error-free frame always producing the result $C4. Although the CRC byte is normally generated with
hardware, the CRC calculation can be done in software. Any frame in which the error detection byte does
not produce the proper result is discarded by all receivers, and any in-frame response, if required, is not
transmitted.
Arbitration
Arbitration on the multiplex bus is accomplished in a non-destructive manner, allowing the frame with the
highest priority to be transmitted, while any transmitters which lose arbitration simply stop transmitting and
wait for an idle bus to begin transmitting again. If multiple nodes begin to transmit at the same time,
Table 1. J1850 Protocol Options
Feature
1 & 3-Byte
Headers
1 & 3-Byte
Headers
Single-Byte
Header
Bit Encoding
PWM
VPW
VPW
Bus Medium
Dual Wire
Single Wire
Single Wire
Data Rate
41.7 kbps
10.4 kbps
10.4 kbps
Data Integrity
CRC
CRC
CRC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC708LN56 | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| MC68HC711J6 | 8-BIT MICROCONTROLLER |
| MC68HC711J6FN | 8-BIT MICROCONTROLLER |
| MC68HC711J6FS | 8-BIT MICROCONTROLLER |
| MC68HC711J6FU | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC706P6ACDW | 制造商:Motorola Inc 功能描述: |
| MC68HC708MP16CFU | 制造商:MAJOR 功能描述: |
| MC68HC711D3CFBE2 | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC711D3CFN2 | 功能描述:IC MCU 2MHZ 4K OTP 44-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC711D3CFNE2 | 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。