- 您現在的位置：買賣IC網 > 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： | 15/28頁 |
| 文件大小： | 220K |
| 代理商： | MC68HC705V8 |
第1頁第2頁第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頁當前第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
15
If the Type bit of the first byte is clear, indicating that the message is a functionally addressed message, the
second byte of the message, the target address byte, is then retrieved. This byte is compared to each
functional I.D. for which a Received Message Buffer has been reserved. If a match is found, the Received
Message Buffer Pointer corresponding to that functional I.D. is loaded into MCU RAM location "buff_ndx".
The data bytes are then retrieved and stored in the MCU RAM message buffer which corresponds to that
functional I.D. The target and source address bytes of the message are not retained. It is not necessary to
retain these bytes of the message, since a logical assumption is that the functional I.D. must be known to
the receiver already, and the source address is of no use since the function, and not the source, of the
message data is what is important.
When a message of interest to the user is received, the RXMS interrupt will be cleared when the number of
received message bytes in the MRSR is read prior to retrieval of the message data bytes. Once the data
bytes of interest are retrieved, then the MRSR is written to, releasing the Rx buffer back to the MDLC. If a
message which does not pass the message filtering criteria is received, the write to the MRSR to release
the Rx buffer and discard the message also serves to clear the RXMS interrupt generated by that
message.
This procedure results in each MCU RAM receive buffer containing the latest data received for each
specific functional I.D., and for the most recently received node-to-node message. The CPU can access
this data whenever it needs updated information. Whenever this stored data is accessed, however, the
user should first set the I-bit to inhibit interrupts. If a receive interrupt is serviced while the CPU is
accessing this stored data, it is possible that the CPU could end up reading partial data from two different
received messages.
Refer to
Figure 7a MDLC Interrupt Service Routine (cont.’d)
and
Figure 7b MDLC Interrupt Service
Routine (concluded)
for a flow diagram of the sequence followed when an MDLC interrupt of the CPU
occurs.
Error Handling
The basic driver routines in Appendix A do not contain extensive error handling procedures. Since any
message in which an error is detected is discarded by the receiver, the user has no need (or way) to
monitor receive errors as they occur. The user can monitor, to a limited extent, the status of the multiplex
bus through the use of a test message, or by monitoring time between received messages.
When transmitting a message, the user can determine whether a loss of arbitration or a transmission error
has occurred by checking messages received after a transmission has been originated. If messages of
higher priority are continually received, the user may wish to abort the transmission and retry using a
higher message priority. If more than one message of lower priority is detected following the initiation of a
message transmission, the user may assume a transmit error occurred, and initiate another attempt to
transmit the message, if so desired.
相關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 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 其它有關文件:STM32F101T8 View All Specifications 特色產品: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 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數: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 數據轉換器:A/D 10x12b 振蕩器型:內部 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 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
發布緊急采購，3分鐘左右您將得到回復。