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| 型号： | MC68HC705C9ACFB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 78/118页 |
| 文件大小： | 750K |
| 代理商： | MC68HC705C9ACFB |
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Serial Communications Interface (SCI)
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
62
Freescale Semiconductor
9.6 Data Format
Receive data or transmit data is the serial data that is transferred to the internal data bus from the receive
data input pin (RDI) or from the internal bus to the transmit data output pin (TDO). The non-return-to-zero
(NRZ) data format shown in Figure 9-3 is used and must meet the following criteria:
The idle line is brought to a logic 1 state prior to transmission/reception of a character.
A start bit (logic 0) is used to indicate the start of a frame.
The data is transmitted and received least significant bit first.
A stop bit (logic 1) is used to indicate the end of a frame. A frame consists of a start bit, a character
of eight or nine data bits, and a stop bit.
A break is defined as the transmission or reception of a low (logic 0) for at least one complete frame
time.
Figure 9-3. Data Format
9.7 Receiver Wakeup Operation
The receiver logic hardware also supports a receiver wakeup function which is intended for systems
having more than one receiver. With this function a transmitting device directs messages to an individual
receiver or group of receivers by passing addressing information as the initial byte(s) of each message.
The wakeup function allows receivers not addressed to remain in a dormant state for the remainder of the
unwanted message. This eliminates any further software overhead to service the remaining characters of
the unwanted message and thus improves system performance.
The receiver is placed in wakeup mode by setting the receiver wakeup bit (RWU) in the SCCR2 register.
While RWU is set, all of the receiver-related status flags (RDRF, IDLE, OR, NF, and FE) are inhibited
(cannot become set).
NOTE
The idle line detect function is inhibited while the RWU bit is set. Although
RWU may be cleared by a software write to SCCR2, it would be unusual to
do so.
Normally, RWU is set by software and is cleared automatically in hardware by one of these methods: idle
line wakeup or address mark wakeup.
9.8 Idle Line Wakeup
In idle line wakeup mode, a dormant receiver wakes up as soon as the RDI line becomes idle. Idle is
defined as a continuous logic high level on the RDI line for 10 (or 11) full bit times. Systems using this
type of wakeup must provide at least one character time of idle between messages to wake up sleeping
receivers, but must not allow any idle time between characters within a message.
IDLE LINE
012345678
0
STOP START
START
CONTROL BIT M SELECTS
8- OR 9-BIT DATA
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC68HC705C9ACFBE | 功能描述:8位微控制器 -MCU 8B MCU 352 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| MC68HC705C9ACFN | 功能描述:IC MCU 2.1MHZ 16K OTP 44-PLCC 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 |
| MC68HC705C9ACFNE | 功能描述:8位微控制器 -MCU 8B MCU 352 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| MC68HC705C9ACP | 功能描述:IC MCU 2.1MHZ 16K OTP 40-DIP 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 |
| MC68HC705C9ACPE | 制造商:Freescale Semiconductor 功能描述: |
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