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| 型號： | MC68HC711D3CP3 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | PLASTIC, DIP-40 |
| 文件頁數(shù)： | 104/138頁 |
| 文件大?。?/td> | 1047K |
| 代理商： | MC68HC711D3CP3 |
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Serial Communications Interface (SCI)
MC68HC711D3 Data Sheet, Rev. 2.1
68
Freescale Semiconductor
6.5 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.
6.5.1 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.
6.5.2 Address-Mark Wakeup
The serial characters in this type of wakeup consist of seven (eight if M = 1) information bits and an MSB,
which indicates an address character (when set to 1 — mark). The first character of each message is an
addressing character (MSB = 1). All receivers in the system evaluate this character to determine if the
remainder of the message is directed toward this particular receiver. As soon as a receiver determines
that a message is not intended for it, the receiver activates the RWU function by using a software write to
set the RWU bit. Because setting RWU inhibits receiver-related flags, there is no further software
overhead for the rest of this message. When the next message begins, its first character has its MSB set,
which automatically clears the RWU bit and enables normal character reception. The first character
whose MSB is set is also the first character to be received after wakeup because RWU gets cleared
before the stop bit for that frame is serially received. This type of wakeup allows messages to include gaps
of idle time, unlike the idle-line method, but there is a loss of efficiency because of the extra bit time for
each character (address bit) required for all characters.
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| MC68HC711D3VFNE2 | 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(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| MC68HC711E20CFN2 | 功能描述:IC MCU 20K 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(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 |
| MC68HC711E20CFN3 | 功能描述:IC MCU 3MHZ 20K 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(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 |
| MC68HC711E20CFN4 | 功能描述:IC MCU 20K OTP 4MHZ 52-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| MC68HC711E20CFU3 | 制造商:Rochester Electronics LLC 功能描述:8BIT, 20K EPROM, 768RAM. - Bulk 制造商:Freescale Semiconductor 功能描述: 制造商:Motorola Inc 功能描述: |
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