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29.3.6 VBOOST Control
The boost voltage is configurable. By programming the VBLEV bits in LCD_DISPCTRL, the boost voltage
level can be adjusted between 3.0V and 3.6V.
The boost circuit will use an update frequency given by the VBFREQ bits in CMU_LCDCTRL, see
Table 29.8 (p. 429) ). It is possible to adjust the frequency to optimize performance for all kinds of LCD
panels (large capacitors may require less frequent updates, while small capacitors may require more
frequent updates). A lower update frequency would in general lead to smaller current consumption.
Table 29.8. LCD V BOOST Frequency
VBFREQ
000
001
010
011
100
101
110
111
V BOOST Update Frequency
LFACLK
LFACLK/2
LFACLK/4
LFACLK/8
LFACLK/16
LFACLK/32
LFACLK/64
LFACLK/128
29.3.7 Framerate
It is important to choose the correct framerate for the LCD display. Normally, the framerate should be
between 30 and 100 Hz. A framerate below 30 Hz may lead to flickering, while a framerate above 100
Hz may lead to ghostering and unnecessarily high power consumption.
29.3.7.1 Clock Selection and Prescaler
The LFACLK is prescaled to LFACLK LCDpre in the CMU. The available prescaler settings are:
?
?
?
?
LFCLK16: LFACLK LCDpre = LFACLK/16
LFCLK32: LFACLK LCDpre = LFACLK/32
LFCLK64: LFACLK LCDpre = LFACLK/64
LFCLK128: LFACLK LCDpre = LFACLK/128
In addition to selecting the correct prescaling, the clock source can be selected in the CMU.
To use this module, the LE interface clock must be enabled in CMU_HFCORECLKEN0, in addition to
the module clock.
29.3.7.2 Framerate Division Register
The framerate is set in the CMU by programming the framerate division bits FDIV in CMU_LCDCTRL.
This setting should not be changed while the LCD driver is running. The equation for calculating the
resulting framerate is given from Equation 29.1 (p. 429)
LCD Framerate Calculation
LFACLK LCD = LFACLK LCDpre /(1 + FDIV)
(29.1)
2011-04-12 - d0001_Rev1.10
429
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