PIC24FJ128GA310 datasheet(265/406 Pages) MICROCHIP

265 / 406 page

 2010-2011 Microchip Technology Inc.

DS39996F-page 265

PIC24FJ128GA310 FAMILY

21.0

LIQUID CRYSTAL DISPLAY

(LCD) CONTROLLER

The Liquid Crystal Display (LCD) Controller generates

the data and timing control required to directly drive a

static or multiplexed LCD panel. In 100-pin devices

(PIC24FJXXXGA310), the module can drive panels of

up to eight commons and up to 60 segments when 5 to

8 commons are used, or up to 64 segments when 1 to

4 commons are used.

The module has these features:

• Direct driving of LCD panel

• Three LCD clock sources with selectable prescaler

• Up to eight commons:

- Static (One common)

- 1/2 multiplex (two commons)

- 1/3 multiplex (three commons)

- 1/8 multiplex (eight commons)

• Ability to drive from 30 (in 64-pin devices) to

64 (100-pin) segments, depending on the

Multiplexing mode selected

• Static, 1/2 or 1/3 LCD bias

• On-chip bias generator with dedicated charge

pump to support a range of fixed and variable bias

options

• Internal resistors for bias voltage generation

• Software contrast control for LCD using internal

biasing

A simplified block diagram of the module is shown in

Figure 21-1.

FIGURE 21-1:

LCD CONTROLLER MODULE BLOCK DIAGRAM

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

“PIC24F

Family

Reference

Manual”

Section 52. “Liquid Crystal Display

(LCD)”

(DS39740). The information in this

data sheet supersedes the information in

the FRM.

COM<7:0>

Timing Control

Data Bus

SOSC

FRC Oscillator

LPRC Oscillator

512

MUX

SEG<63:0>

To I/O Pins

32 x 16 (= 8 x 64)

LCD DATA

LCDCON

LCDPS

LCDSEx

LCDDATA0

LCDDATA1

LCDDATA30

LCDDATA31

LCD Bias Generation

LCD Clock

Source Select

LCD

Charge Pump

Bias

Voltage

(Secondary Oscillator)

Resistor Ladder

LCDREF

LCDREG

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