Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario descargar pdf (Pagina 93)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

20-1

SECTION 20: LCD CONTROLLER (SPECIFIC TO MAXQ2010)

20.1 LCD Controller Overview

The MAXQ2010 provides an on-board LCD controller module that can generate segment and common signals for an

LCD based on display memory content. Once the LCD controller settings and display memory have been initialized,

the LCD segment and common signals are generated automatically at the selected display frequency. No additional

processor overhead is required while the LCD controller is running.

The LCD controller provides the following features and modes:

• Automatic LCD segment and common drive signal generation

• Four types of display modes supported:

Static

1/2 duty multiplexed with 1/2 bias voltages

1/3 duty multiplexed with 1/3 bias voltages

1/4 duty multiplexed with 1/3 bias voltages

• Up to 43 segment (SEG0 to SEG42) outputs and four common (COM0 to COM3) outputs

• Unused segment outputs SEG0 to SEG39 can be used as general-purpose port pins

• 21 bytes (168 bits) of display memory

• Unused display memory can be used for general-purpose storage

• Flexible LCD clock source, selectable from 32kHz or (high-frequency clock source/512)

• Adjustable frame frequency

• Internal voltage-divider resistors eliminate requirement for external components

• Internal adjustable resistor allows contrast adjustment without external components

• Capability to use external resistors to adjust drive voltages and current capacity

Figure 20-1. LCD Controller Block Diagram

FRAME

FREQUENCY

TIMING CONTROL

SEGMENT DRIVER

COMMON DRIVER

WAVEFORM GENERATION

DISPLAY MEMORY

(REGISTER FILE)

LCFG

OPM

LCRA

DPE

PCF

LRIG

BIAS

DUTY

FRM

LCD

FRAME

SEG0

SEG39

COM0

COM1/SEG42

COM2/SEG41

COM3/SEG40

LCD

LCD1

LCD2

ADJ

VOLTAGE CONTROL

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 146 147

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