- 您现在的位置：买卖IC网 > PDF目录45223 > MC68HC05V7FN (MOTOROLA INC) 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 PDF资料下载
参数资料
| 型号： | MC68HC05V7FN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 28/170页 |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7FN |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页当前第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页
SECTION 15: MESSAGE DATA LINK CONTROLLER
MOTOROLA
Page 109
MC68HC05V7 Specification Rev. 1.0
15.4.3
STATE MACHINE
All of the functions associated with performing the protocol are executed or controlled by
the State Machine. The State Machine is responsible for framing, collision detection,
arbitration, CRC generation/checking, and error detection. The following sections describe
the MDLC’s actions in a variety of situations.
15.4.3.1
In-Frame Response
The MDLC does not support the In-Frame Response (IFR) feature of J1850. If the MDLC
receives an IFR, it will ignore the response (not placing it in an Rx Buffer) and wait for the
End of Frame (EOF) symbol.
15.4.3.2
4x Speed Mode
The MDLC can exist on the same J1850 bus as modules which use a special 4x mode of
J1850 VPW operation. The MDLC treats 4x mode messages as noise and ignores them.
The MDLC will wait for a valid SOF or BREAK at 10.4 kbps to resume normal operation.
15.4.3.3
Block Mode
While the MDLC can only transmit a maximum of 12 bytes (including CRC byte) in a given
message, it has the ability to receive a message of unlimited length. Like 4x mode, the
programmer will have to determine from a received message that Block mode is to be
enabled. The programmer then sets the “Receive Block Message” (RXBM) bit in the MDLC
Control Register (MCR) to indicate to the MDLC that the following message will be longer
than 12 bytes and not to treat it as a message over length error.
15.4.3.4
Arbitration
Arbitration is performed by the MDLC simply by comparing the data being received from
the J1850 bus with the data being transmitted. This is done by latching the data being
transmitted into a comparator, where it is compared with the data being received from the
J1850 bus. If a valid data bit is received which has a higher priority over what was
transmitted (0 over 1), arbitration is then lost, and the transmitter stops transmitting until a
valid EOF symbol is received from the J1850 bus. See 15.5.5 MESSAGE ARBITRATION
for more information.
If an invalid bit or a symbol in a non-byte boundary is detected, the transmitter will also stop
transmitting.
In VPW, an active signal will always dominate a passive one, and a shorter passive symbol
will dominate a longer passive symbol. This ensures that a logic zero will dominate a logic
one, and the message with the highest priority (lowest value) will win arbitration. See 15.5.5
MESSAGE ARBITRATION for more details.
15.4.3.5
J1850 Bus Errors
The MDLC detects several types of transmit and receive errors which can occur during the
transmission of a message onto the J1850 bus.
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC05V7CB | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| MC68HC05V7CFU | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP64 |
| MC68HC05X16FU | 8-BIT, MROM, MICROCONTROLLER, PQFP64 |
| MC68HC705X32FU | 8-BIT, OTPROM, MICROCONTROLLER, PQFP64 |
| MC68HC05X16MFU | 8-BIT, MROM, MICROCONTROLLER, PQFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC05X16 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X32 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor HCMOS) microcontroller unit |
| MC68HC05X4 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4CDW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05X4DW | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
发布紧急采购，3分钟左右您将得到回复。