57.4.2 WFyTOx registers
For a segment on the LCD panel to be displayed, data must be written to the WFyTOx
registers. For LCD pins enabled as frontplanes, each bit in the WFyTOx registers
corresponds to a segment on an LCD panel. The different phases (A-H) represent the
different backplanes of the LCD panel. The selected LCD duty cycle controls the number
of implemented phases. Refer to the
for normal LCD operation the phases
follow the sequence shown.
For LCD pins enabled as a backplane, the WFyTOx register assigns the phase in which
the backplane pin is active. This is how backplane assignment is done.
An example of normal operation follows.
To enable LCD_P0 to operate as backplane 0.
1. Enable the LCD_P0 by setting PEN0 bit in the PENL register, PENL = 0x00000001.
2. Configure LCD_P0 as a backplane pin by setting the BPEN0 bit in the BPEN0
register.
3. The WF0 bit in the WF3TO0 register is set to associate LCD_P0 with backplane
phase A, WF3to0 =0x00000001.
This configures LCD_P0 to operate as a backplane that is active in phase A.
For LCD pins enabled as a frontplane:
• Writing 1 to a given WF location results in the corresponding display segment being
driven with the differential root mean square (RMS) voltage necessary to turn the
segment on during the phase selected.
• Writing 0 to a given location results in the corresponding display segment being
driven with the differential RMS voltage necessary to turn the segment off during the
phase selected.
57.4.3 LCD display modes
The LCD controller can be configured to implement several different display modes. In
the LCD auxiliary register (AR), the bits ALT and BLANK configure the different
display modes:
Normal display mode (default)
The LCD segments are controlled by the data placed in the WFyTOx registers, as
described in the preceding section.
Blank display mode
The WF data is bypassed and the frontplane and backplane pins are configured to clear
all segments.
Functional description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1772
Freescale Semiconductor, Inc.
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