參數(shù)資料
型號(hào)： MC68HC11A1MFN2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 101/158頁
文件大?。?/td> 3803K
代理商： MC68HC11A1MFN2
SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
TECHNICAL DATA
5-3
5
Once a valid start bit is detected, the start bit, each data bit, and the stop bit are sam-
pled three times at RT intervals 8 RT, 9 RT, and 10 RT (1 RT is the position where the
bit is expected to start), as shown in Figure 5-2. The value of the bit is determined by
voting logic which takes the value of the majority of samples.
Figure 5-2 Sampling Technique Used on All Bits
5.5 Start Bit Detection
When the RxD input is detected low, it is tested for three more sample times (referred
to as the start edge verification samples in Figure 5-3). If at least two of these three
verification samples detect a logic zero, a valid start bit has been detected, otherwise
the line is assumed to be idle. A noise flag is set if all three verification samples do not
detect a logic zero. A valid start bit could be assumed with a set noise flag present.
If there has been a framing error without detection of a break (10 zeros for 8-bit format
or 11 zeros for 9-bit format), the circuit continues to operate as if there actually was a
stop bit and the start edge will be placed artificially. The last bit received in the data
shift register is inverted to a logic one, and the three logic one start qualifiers (shown
in Figure 5-3) are forced into the sample shift register during the interval when detec-
tion of a start bit is anticipated (see Figure 5-4); therefore, the start bit will be accepted
no sooner than it is anticipated.
If the receiver detects that a break produced the framing error, the start bit will not be
artificially induced and the receiver must actually detect a logic one before the start bit
can be recognized. See Figure 5-5.
16
1
8
9
10
RxD
SCI BIT SAMPLING
PREVIOUS BIT
PRESENT BIT
NEXT BIT
SAMPLES
16
1
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RRR
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC11A1MFNE 功能描述:8位微控制器 -MCU 8B MCU 256RAM 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
MC68HC11A1MFNER 功能描述:8位微控制器 -MCU 8B MCU 256RAM 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
MC68HC11A1MFU2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
MC68HC11A1MP 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-Bit Microcontrollers
MC68HC11A1MP2 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS Single-Chip Microcontroller
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