參數(shù)資料
型號： MC68HC08LT8CFGE
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù)： 134/156頁
文件大?。?/td> 1107K
代理商： MC68HC08LT8CFGE
Functional Description
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
79
8.4.2 LCD Voltages (VLCD, VLCD1, VLCD2, VLCD3)
The voltage VLCD is from the VLCD pin and must not exceed VDD. VLCD1, VLCD2, and VLCD3 are internal
bias voltages for the LCD driver waveforms. They are derived from VLCD using a resistor ladder (see
The relative potential of the LCD voltages are:
VLCD = VDD
VLCD1 = 2/3 × (VLCD – Vbias)
VLCD2 = 1/3 × (VLCD – Vbias)
VLCD3 = Vbias
The VLCD3 bias voltage, Vbias, is controlled by the LCD contrast control bits, LCCON[2:0].
8.4.3 LCD Cycle Frame
The LCD driver module uses the 32KXCLK (see Chapter 5 Oscillator (OSC)) as the input reference clock.
This clock is divided to produce the LCD waveform base clock, LCDCLK, by configuring the LCLK[2:0]
bits in the LCD clock register. The LCDCLK clocks the backplane and the frontplane output waveforms.
The LCD cycle frame is determined by the equation:
For example, for 1/3 duty and 256Hz waveform base clock:
8.4.4 Fast Charge and Low Current
The default value for each of the bias resistors (see Figure 8-3), RLCD, in the resistor ladder is
approximately 37k
at V
LCD = 3 V. The relatively high current drain through the 37 k resistor ladder may
not be suitable for some LCD panel connections. Lowering this current is possible by setting the LC bit in
the LCD control register, switching the RLCD value to 146k.
Although the lower current drain is desirable, but in some LCD panel connections, the higher current is
required to drive the capacitive load of the LCD panel. In most cases, the higher current is only required
when the LCD waveforms change state (the rising and falling edges in the LCD output waveforms). The
fast charge option is designed to have the high current for the switching and the low current for the steady
state. Setting the FC bit in the LCD control register selects the fast charge option. The RLCD value is set
to 37k
(for high current) for a fraction of time for each LCD waveform switching edge, and then back to
146k
for the steady state period. The duration of the fast charge time is set by configuring the
FCCTL[1:0] bits in the LCD clock register, and can be LCDCLK/32, LCDCLK/64, or LCDCLK/128. Figure
8-4 shows the fast charge clock relative to the BP0 waveform.
LCD CYCLE FRAME =
LCD WAVEFORM BASE CLOCK
× DUTY
1
LCD CYCLE FRAME =
256
× (1/3)
1
= 11.72 ms
相關(guān)PDF資料
PDF描述
MC68HC11G5CFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC84
MC68HC11G5CFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC84
MC68HC11L6VFU23 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PQFP64
MC68HC11L6CFU22 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64
MC68HC11L6VFU22 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP64
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC68HC08MR4 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:In-Circuit Simulator
MC68HC08P4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT
MC68HC08QT1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08QT2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08QT4 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*