• 1/4 duty (4 backplanes) (Phase A, B, C, D), 1/3 bias (4 voltage levels)
• 1/5 duty (5 backplanes) (Phase A, B, C, D, E), 1/3 bias (4 voltage levels)
• 1/6 duty (6 backplanes) (Phase A, B, C, D, E, F), 1/3 bias (4 voltage levels)
• 1/7 duty (7 backplanes) (Phase A, B, C, D, E, F, G), 1/3 bias (4 voltage levels)
• 1/8 duty (8 backplanes) (Phase A, B, C, D, E, F, G, H), 1/3 bias (4 voltage levels)
All modes are 1/3 bias. These modes of operation are described in more detail in the
following sections.
57.4.1.1 LCD duty cycle
The denominator of the duty cycle indicates the number of LCD panel segments capable
of being driven by each individual frontplane output driver. Depending on the duty cycle,
the LCD waveform drive can be categorized as static or multiplexed.
In static-driving method, the LCD is driven with two square waveforms. The static-
driving method is the most basic method to drive an LCD panel, but because each
frontplane driver can drive only one LCD segment, static driving limits the LCD
segments that can be driven with a given number of frontplane pins. In static mode, only
one backplane is required.
In multiplexed mode, the LCD waveforms are multi-level and depend on the bias mode.
Multiplex mode, depending on the number of backplanes, can drive multiple LCD
segments with a single frontplane driver. This reduces the number of driver circuits and
connections to LCD segments. For multiplex mode operation, at least two backplane
drivers are needed. The LCD controller is optimized for multiplex mode.
The numerator of the duty cycle indicates the amount of time the LCD panel segment is
energized during each LCD controller frame cycle. The denominator of the duty cycle
indicates the number of backplanes that are being used to drive an LCD panel and the
number of phase sequences, 1 to 8.
The duty cycle is used by the backplane phase generator to set the phase outputs. The
phase outputs A-H are driven according to the sequence shown below. The sequence is
repeated at the LCD frame frequency. The duty cycle is configured using the DUTY[2:0]
bit field in the GCR, as shown in the following table.
Chapter 57 LCD Controller (SLCD)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
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