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Note
If the MUX and BIAS settings in LCD_DISPCTRL are changed while the LCD driver is
enabled, the output waveform is unpredictable and may lead to a DC-component for one
LCD frame.
The MUX setting determines the number of LCD COM lines that are enabled. When static multiplexing
is selected, LCD output is enabled on LCD_COM0, when duplex multiplexing is used, LCD_COM0-
LCD_COM1 are used, when triplex multiplexing is selected, LCD_COM0-LCD_COM2 are used, and
finally when quadruplex multiplexing is selected, all COM lines are driven by the LCD driver.
See Section 29.3.3 (p. 417) for waveforms for the different bias and multiplexing settings.
The waveforms generated by the LCD controller can be generated in two different versions, regular
and low-power. The low power mode waveforms have a lower switching frequency than the regular
waveforms, and thus consume less power. The WAVE bit in LCD_DISPCTRL decides which waveforms
to generate. An example of a low-power waveform is shown in Figure 29.2 (p. 416) , and an example
of a regular waveform is shown in Figure 29.3 (p. 417) .
Table 29.1. LCD Mux Settings
MUX
Mode
Multiplexing
00
01
10
11
0
0
0
0
Static
Duplex
Triplex
Quadruplex
Static (segments can be multiplexed with LCD_COM[0])
Duplex (segments can be multiplexed with LCD_COM[1:0])
Triplex (segments can be multiplexed with LCD_COM[2:0])
Quadruplex (segments can be multiplexed with
LCD_COM[3:0])
Table 29.2. LCD BIAS Settings
BIAS
00
01
10
11
Mode
Static
Half Bias
Third Bias
Reserved
Bias setting
Static (2 levels)
1/2 Bias (3 levels)
1/3 Bias (4 levels)
Reserved
Table 29.3. LCD Wave Settings
WAVE
0
1
Mode
LowPower
Normal
Wave mode
Low power optimized waveform output
Regular waveform output
Figure 29.2. LCD Low-power Waveform for LCD_COM0 in Quadruples Multiplex Mode, 1/3 Bias
V LC0 (V LCD )
V LC1 (2/3V LCD )
V LC2 (1/3V LCD )
V LC3 (V SS )
Fram e Start
Fram e End
2011-04-12 - d0001_Rev1.10
416
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