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| 型号： | MC68HC705BS8FB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 90/128页 |
| 文件大小： | 9691K |
| 代理商： | MC68HC705BS8FB |
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8-4
MC68HC05BS8
M-BUS SERIAL INTERFACE
8
8.2.3
Data Transfer
Once a successful slave addressing is achieved, the data transfer can proceed byte by byte in a
direction specied by the R/W bit sent by the calling master.
Each data byte is 8 bits long. Data can be changed only when SCL is low and must be held stable
when SCL is high as shown in Figure 8-2. One clock pulse is for one bit of data transfer, MSB is
transferred rst. Each data byte has to be followed by an acknowledge bit. Hence, one complete
data byte transfer requires 9 clock pulses.
If the slave receiver does not acknowledge the master, the SDA line should be left high by the
slave, the master can then generate a STOP signal to abort the data transfer or a START signal
(repeated START) to commence a new calling.
If the master receiver does not acknowledge the slave transmitter after one byte transmission, it
means an “end of data” to the slave. The slave shall release the SDA line for the master to
generate STOP or START signal.
8.2.4
Repeated START Signal
As shown in Figure 8-2, a repeated START signal is to generate a START signal without rst
generating a STOP signal to terminate the communication. This is used by the master to
communicate with another slave or with the same slave in a different mode (transmit/receive
mode) without releasing the bus.
8.2.5
STOP Signal
The master can terminate the communication by generating a STOP signal to free the bus.
However, the master may generate a START signal followed by a calling command without
generating a STOP signal rst. This is called repeat START. A STOP signal is dened as a low to
high transition of SDA while SCL is at a logical high; see Figure 8-2.
8.2.6
Arbitration Procedure
This interface circuit is a true multi-master system which allows more than one master to be
connected. If two or more masters try to control the bus at the same time, a clock synchronization
procedure determines the bus clock. The clock low period is equal to the longest clock low period
among the masters; and the clock high period is the shortest among the masters. A data
arbitration procedure determines the priority. A master will lose arbitration if it transmits a logic “1”
while the others transmit logic “0”, the losing master will immediately switch over to slave receive
mode and stops its data and clock outputs. The transition from master to slave mode will not
TPG
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| MC68HC705C4ACP | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC705C8AB | 功能描述:IC MCU 8K OTP 2.1MHZ 42-SDIP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC705C8ACB | 制造商:Rochester Electronics LLC 功能描述:HCO5 CORE + 8K RAM + EPR - Bulk |
| MC68HC705C8ACFB | 功能描述:IC MCU 8K 4MHZ OTP 44-QFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有关文件:STM32F101T8 View All Specifications 特色产品:STM32 32-bit Cortex MCUs 标准包装:490 系列:STM32 F1 核心处理器:ARM? Cortex?-M3 芯体尺寸:32-位 速度:36MHz 连通性:I²C，IrDA，LIN，SPI，UART/USART 外围设备:DMA，PDR，POR，PVD，PWM，温度传感器，WDT 输入/输出数:26 程序存储器容量:64KB（64K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:10K x 8 电压 - 电源 (Vcc/Vdd):2 V ~ 3.6 V 数据转换器:A/D 10x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:36-VFQFN，36-VFQFPN 包装:托盘 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... 其它名称:497-9032STM32F101T8U6-ND |
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