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| 型號(hào)： | MC68HC11E1 |
| 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)： | 121/268頁(yè) |
| 文件大小： | 2221K |
| 代理商： | MC68HC11E1 |
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Serial Communications Interface (SCI)
SCI Error Detection
M68HC11E Family — Rev. 5
Data Sheet
MOTOROLA
Serial Communications Interface (SCI)
For More Information On This Product,
Go to: www.freescale.com
121
7.5.2 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,
or 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.
7.6 SCI Error Detection
Three error conditions – SCDR overrun, received bit noise, and framing – can
occur during generation of SCI system interrupts. Three bits (OR, NF, and FE) in
the serial communications status register (SCSR) indicate if one of these error
conditions exists.
The overrun error (OR) bit is set when the next byte is ready to be transferred from
the receive shift register to the SCDR and the SCDR is already full (RDRF bit is
set). When an overrun error occurs, the data that caused the overrun is lost and
the data that was already in SCDR is not disturbed. The OR is cleared when the
SCSR is read (with OR set), followed by a read of the SCDR.
The noise flag (NF) bit is set if there is noise on any of the received bits, including
the start and stop bits. The NF bit is not set until the RDRF flag is set. The NF bit
is cleared when the SCSR is read (with FE equal to 1) followed by a read of the
SCDR.
When no stop bit is detected in the received data character, the framing error (FE)
bit is set. FE is set at the same time as the RDRF. If the byte received causes both
framing and overrun errors, the processor only recognizes the overrun error. The
framing error flag inhibits further transfer of data into the SCDR until it is cleared.
The FE bit is cleared when the SCSR is read (with FE equal to 1) followed by a read
of the SCDR.
F
Freescale Semiconductor, Inc.
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| MC68HC11E1CFN2 | 功能描述:IC MCU 512 EEPROM 2MHZ 52-PLCC RoHS:否 類(lèi)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(lèi)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(pán) 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(chēng):497-9032STM32F101T8U6-ND |
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