參數(shù)資料
型號(hào)： MC68HC705L16
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁(yè)數(shù)： 2/28頁(yè)
文件大?。?/td> 139K
代理商： MC68HC705L16
Application Note
AN1763
2
MOTOROLA
Liquid Crystal Displays
To understand the types of waveforms that drive LCD displays, it is
helpful to understand a few fundamentals about LCDs.
For example, liquid crystal displays are composed of a polarizing liquid
crystalline material in between two plates of glass. Typically, one plate
is called the common or backplane, and the other is called a segment or
frontplane. In a reflective LCD panel (one that has no back light), a
voltage difference applied across the two electrodes will result in a
polarization which will prevent the light from reflecting back to the
observer. This will appear as a dark segment and is, therefore,
considered ON. A lack of voltage difference will allow the light to reflect
back and is considered OFF.
Contrast
Due to the chemical nature of the liquid crystal material, DC voltages
cannot be used to drive the segments or else permanent damage can
occur to the LCD. To avoid this problem, voltage levels are applied to the
electrodes for a short period and then the levels are reversed to the
electrodes for an equal period. This AC waveform will produce an RMS
voltage across the LCD, yet it has a net DC value of 0 volts. As a result,
LCD material has its contrast specified in terms of an RMS voltage. A
typical voltage characteristic for a reflective LCD display is shown in
Figure 1
.
The ON voltage for a segment should be greater than the point where
incident light is reduced by 90 percent. The OFF voltage should be less
than the point where incident light is reduced by 10 percent. For
maximum contrast, the ratio of ON to OFF voltage should be as large as
possible. Examples of how to calculate RMS voltages are shown in a
later section.
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參數(shù)描述
MC68HC705L32FU 制造商:Rochester Electronics LLC 功能描述: 制造商:Freescale Semiconductor 功能描述:
MC68HC705L5FUE 功能描述:8位微控制器 -MCU 705L5-EPP-80QFP-6019 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
MC68HC705MC4CDW 制造商:Motorola 功能描述:MOTOROLA S7D9B
MC68HC705P6ACDW 功能描述:8位微控制器 -MCU 8 Bit 2.1MHz 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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