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29.3 Functional Description
An overview of the LCD module is shown in Figure 29.1 (p. 415) . In its simplest form, an LCD driver
would apply a voltage above a certain threshold voltage in order to darken a segment and a voltage below
threshold to make a segment clear. However, the LCD display segment will degrade if the applied voltage
has a DC-component. To avoid this, the applied waveforms are arranged such that the differential voltage
seen by each segment has an average value of zero, and such that the RMS voltage (or differential sum
of the two waveforms for fast response LCDs) is below the segment threshold voltage if the segment
shall be transparent, and above the segment threshold voltage when the segment shall be dark.
The waveforms are multiplexed between four different common lines and 40 segment lines to support
up to 160 different LCD segments. The common lines and segment lines can be enabled or disabled
individually to prevent the LCD driver from occupying more I/O resources than required.
Figure 29.1. LCD Block Diagram
V BOOST
V INT
V EXT
LCD_BEXT
VLCDSEL
LCD_BCAP_P
LCD_BCAP_N
LCD control and
status
Contrast and bias setting
Mux and fram erate setting
V LC3
Disable
SEG out
40x
LCD
V LC2
voltage
V LC1
LCD_SEGx
LCD segm ent
data register
Display data
generator
V LC0
Special
LCD anim ation
registers
effects
V LC3
Disable
4x
V LC2
COM out
LFACLK LCD
LCD
sequence
generator
V LC1
V LC0
LCD_COMx
For simplicity, only one segment pin and one common terminal is shown in the figure.
29.3.1 LCD Driver Enable
Setting the EN bit in LCD_CTRL enables the LCD driver. The MUX bitfield in LCD_DISPCTRL
determines which COM lines are driven by the LCD driver. By default, LCD_COM0 is driven whenever
the LCD driver is enabled.
The LCD_SEGEN register determines which segment lines are enabled. Segment lines can be enabled
or disabled in groups of 4.
Each LCD segment pin can also be individually disabled by setting the pin to any other state than
DISABLED in the GPIO pin configuration. Note that this feature is not available on EFM32G revisions
A and B.
29.3.2 Multiplexing, Bias, and Wave Settings
The LCD driver supports different multiplexing and bias settings, and these can be set individually in
the MUX and BIAS bits in LCD_DISPCTRL respectively, see Table 29.1 (p. 416) and Table 29.2 (p.
416) .
2011-04-12 - d0001_Rev1.10
415
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