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| MC68HC05L28 Datasheet, PDF (76/156 Pages) Motorola, Inc – Flexible general-purpose microcomputer | |||
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example, when 3-way multiplexing is used, a frame rate of 45.5 Hz instead of 91 Hz can be
obtained. See Section 7.4.
Figure 7-3 to Figure 7-6 show the backplane waveforms and some examples of frontplane
waveforms for each of the operating modes.
The backplane waveforms are continuous and repetitive (every 2 frames); they are ï¬xed within
each operating mode and are not affected by the data in the LCD RAM.
The frontplane waveforms are dependent on the LCD segments to be driven as deï¬ned in the LCD
RAM. Each âonâ 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.
V DD /VLCD
BP0
V2
V0
V DD /VLCD
7
BP1
V2
V0
V DD /VLCD
FPx, example 1 V2
V0
ON
OFF
1 Frame
V DD /VLCD
FPx, example 2 V2
V0
V DD /VLCD
FPx, example 3 V2
V0
V DD /VLCD
FPx, example 4 V2
V0
Note: In this mode V1=V2
Figure 7-3 LCD waveform with 2 backplanes, 1/2 bias
MOTOROLA
7-4
LIQUID CRYSTAL DISPLAY DRIVER MODULE
TPG
MC68HC05L28
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