mc68hc08ln56 Freescale Semiconductor, Inc, mc68hc08ln56 Datasheet - Page 185

• Manufacturer Part Number: mc68hc08ln56
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 15
Liquid Crystal Display Driver (LCD)
15.1 Introduction
The LCD driver module supports a 40 frontplane by 32 backplane display. This allows a maximum of 1280
LCD segments to be driven. Each segment is controlled by a corresponding bit in the LCD RAM. On reset
or on power-up, the drivers are disabled via a display ON (DISON) bit in the LCD control register
(LCDCR).
15.2 Features
Features of the LCD driver include:
15.3 Functional Description
The LCD driver consists of five major submodules:
Figure 15-1
Freescale Semiconductor
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40 Frontplane (FP) drivers by 32 Backplane (BP) Drivers
160 Bytes of Memory Mapped RAM Organized for Easy Bit-Mapped Character Display
Internal Charge Pump Voltage Generator for Creation of Analog Voltage Levels
Timing and control — contains registers and generates frame clock and backplane selects at the
programmed frequency to produce the waveforms
Display RAM — contains the data to be displayed on the LCD panel
Segment drivers — consists of 40 frontplane drivers
Backplane drivers — consists of 32 backplane drivers
Voltage generator — internal charge pump circuit to generate analog voltages
Contrast control — 8-bit contrast resolution allowing analog voltages to remain constant over
operating range of power supply
shows a block diagram of the LCD driver module.
MC68HC08LN56 • MC68HC708LN56 General Release Specification, Rev. 2.1
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