Note
The voltage waveforms applied to the LCD electrodes must
have no DC component. Therefore, a reversed pullup voltage
waveform should be applied before the pullup detect waveform.
Fault detection occupies one frame and the pullup time is half-
frame duration. You must ensure that the fault detection
window set by the sample window width is less than half-frame
duration.
57.5 Initialization section
This section provides a recommended initialization sequence for the LCD controller and
also includes initialization examples for several LCD application scenarios.
57.5.1 Initialization sequence
The below list provides a recommended initialization sequence for the LCD controller.
You must write to all PEN, BPEN, and WFyTOx registers to initialize their values after a
reset.
1. GCR
a. Configure LCD clock source (SOURCE bit).
b. Select 1.0 V or 1.67 V for 3 or 5 V glass (HREFSEL).
c. Enable regulated voltage (RVEN).
d. Trim the regulated voltage (RVTRIM).
e. Enable charge pump (CPSEL bit).
f. Configure LCD controller for doubler or tripler mode (HREFSEL bit).
g. Configure charge pump clock (LADJ[1:0]).
h. Configure LCD power supply (VSUPPLY[1:0]).
i. Configure LCD frame frequency interrupt (LCDIEN bit).
j. Configure LCD behavior in low power mode (LCDWAIT and LCDSTP bits).
k. Configure LCD duty cycle (DUTY[2:0]).
Chapter 57 LCD Controller (SLCD)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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