參數(shù)資料
型號： MC68HCP11A1CFN3
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： HCMOS Single-Chip Microcontroller
中文描述： 8-BIT, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52
封裝： PLASTIC, LCC-52
文件頁數(shù)： 47/158頁
文件大?。?/td> 776K
代理商： MC68HCP11A1CFN3
MC68HC11A8
TECHNICAL DATA
SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
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
R
T
1
R
T
8
R
T
9
R
T
10
R
T
RxD
SCI BIT SAMPLING
PREVIOUS BIT
PRESENT BIT
SAMPLES
NEXT BIT
16
R
T
1
R
T
v
v
v
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HCP11A1FN 制造商:MOTORALA 功能描述:
MC68HCP11E0CP2 制造商:Rochester Electronics LLC 功能描述:- Bulk
MC68HCP11E0FN 功能描述:MICROCONTROLLER MCU 8ADC 3MHC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 標準包裝: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
MC68HCP11E0FNE 功能描述:8位微控制器 -MCU 8B MCU 512RAM COP A/D 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 安裝風格:SMD/SMT
MC68HCP11E1CFNE2 功能描述:8位微控制器 -MCU 8B MCU 512 BYTES RAM 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 安裝風格:SMD/SMT
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