LCD Driver (LCD64F6B)
MPC5606S Microcontroller Reference Manual, Rev. 7
786
Freescale Semiconductor
22.2
Introduction
22.2.1
Overview
The LCD driver module has up to 64 frontplane drivers (
n
) and up to 6 backplane drivers (
m
) so that a
maximum of 384 LCD segments are controllable. The actual implementation (
n
,
m
) depends on the device
specification. Each segment is controlled by a corresponding bit in the LCD RAM.
m
multiplex modes
(1/1, 1/2,...1/
m
duty), and three bias (1/1, 1/2, 1/3) methods are available. The V
0
voltage is the lowest level
of the output waveform and V
3
becomes the highest level. All frontplane and backplane pins can be
multiplexed with other Port functions.
The LCD driver system consists of five major submodules:
•
Timing and control – consists of registers and control logic for frame clock generation, bias voltage
level select, frame duty select, contrast adjustment, backplane select and frontplane select/enable,
remapping of backplane drivers to produce the required frame frequency and voltage waveforms.
•
LCD RAM – contains the data to be displayed on the LCD. Data can be read from or written to the
display RAM at any time.
•
Frontplane drivers – consists of
n
frontplane drivers.
•
Backplane drivers – consists of
m
backplane drivers.
•
Voltage generator – Based on reference voltage, i.e. applied to VLCD, it generates the voltage
levels for the timing and control logic to produce the frontplane and backplane waveforms.
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