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| 型號(hào)： | MC68HC711E9 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-channel, 8-bit analog-to-digital (A/D) converter |
| 中文描述： | 8通道，8位模擬至數(shù)字（A / D）轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 119/268頁(yè) |
| 文件大小： | 2221K |
| 代理商： | MC68HC711E9 |
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Serial Communications Interface (SCI)
Receive Operation
M68HC11E Family — Rev. 5
Data Sheet
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
119
7.4 Receive Operation
During receive operations, the transmit sequence is reversed. The serial shift
register receives data and transfers it to a parallel receive data register (SCDR) as
a complete word. This double buffered operation allows a character to be shifted
in serially while another character is already in the SCDR. An advanced data
recovery scheme distinguishes valid data from noise in the serial data stream. The
data input is selectively sampled to detect receive data, and a majority voting circuit
determines the value and integrity of each bit. See
Figure 7-2
.
7.5 Wakeup Feature
The wakeup feature reduces SCI service overhead in multiple receiver systems.
Software for each receiver evaluates the first character of each message. The
receiver is placed in wakeup mode by writing a 1 to the RWU bit in the SCCR2
register. While RWU is 1, all of the receiver-related status flags (RDRF, IDLE, OR,
NF, and FE) are inhibited (cannot become set). Although RWU can be cleared by
a software write to SCCR2, to do so would be unusual. Normally, RWU is set by
software and is cleared automatically with hardware. Whenever a new message
begins, logic alerts the sleeping receivers to wake up and evaluate the initial
character of the new message.
Two methods of wakeup are available:
Idle-line wakeup
Address-mark wakeup
During idle-line wakeup, a sleeping receiver awakens as soon as the RxD line
becomes idle. In the address-mark wakeup, logic 1 in the most significant bit (MSB)
of a character wakes up all sleeping receivers.
7.5.1 Idle-Line Wakeup
To use the receiver wakeup method, establish a software addressing scheme to
allow the transmitting devices to direct a message to individual receivers or to
groups of receivers. This addressing scheme can take any form as long as all
transmitting and receiving devices are programmed to understand the same
scheme. Because the addressing information is usually the first frame(s) in a
message, receivers that are not part of the current task do not become burdened
with the entire set of addressing frames. All receivers are awake (RWU = 0) when
each message begins. As soon as a receiver determines that the message is not
intended for it, software sets the RWU bit (RWU = 1), which inhibits further flag
setting until the RxD line goes idle at the end of the message. As soon as an idle
line is detected by receiver logic, hardware automatically clears the RWU bit so that
the first frame of the next message can be received. This type of receiver wakeup
requires a minimum of one idle-line frame time between messages and no idle time
between frames in a message.
F
Freescale Semiconductor, Inc.
n
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC711E9 K81H WAF | 制造商:Motorola Inc 功能描述: |
| MC68HC711E9CFN | 制造商:Rochester Electronics LLC 功能描述: |
| MC68HC711E9CFN2 | 功能描述:IC MCU 12K 2MHZ OTP 52-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(biāo)準(zhǔn)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(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)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 |
| MC68HC711E9CFN3 | 功能描述:IC MCU 3MHZ 12K OTP 52-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(biāo)準(zhǔn)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(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)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 |
| MC68HC711E9CFNE2 | 功能描述:8位微控制器 -MCU 8B OTP 512RAM A/D EE 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
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