參數(shù)資料
型號: MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 3/145頁
文件大小: 673K
代理商: MC68HC05CL48
GENERAL RELEASE SPECIFICATION
June 11, 1997
MOTOROLA
LCD DRIVER
MC68HC05CL48
12-4
REV 2.0
12.2
LCD OPERATION
Figure 12-2 shows the backplane waveforms and some examples of frontplane
waveforms which are dependent on the LCD segments to be driven as dened in
the LCD RAM. Each “on” segment must have a differential driving voltage (BP-FP)
applied to it once in each frame; the LCD driver module hardware uses the data in
the LCD RAM to construct the frontplane waveform to meet this criterion. The
backplane waveforms are continuous and repetitive (every 2 frames); they are
xed and not affected by the data in the LCD RAM. During WAIT mode the LCD
drivers function as normal and will keep the display active if the DISON bit (bit0 of
$07) is set.
The LCD drivers can be congured to operate with either 16 backplanes or 8
backplanes under software control.
The bias ratio can be set 1:4 or 1/5 under software control for both a 8 and 16
backplane LCD. The voltage levels required are generated internally by a resistive
divider between VLCD and VSS.
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