INTEDG datasheet(335/478 Pages) MICROCHIP

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DS41414D-page 335

PIC16(L)F1946/47

27.0 LIQUID CRYSTAL DISPLAY

(LCD) DRIVER MODULE

The Liquid Crystal Display (LCD) driver module

generates the timing control to drive a static or

multiplexed LCD panel. In the PIC16(L)F1946/47

device, the module drives the panels of up to four

commons and up to 46 segments. The LCD module

also provides control of the LCD pixel data.

The LCD driver module supports:

• Direct driving of LCD panel

• Three LCD clock sources with selectable prescaler

• Up to four common pins:

- Static (1 common)

- 1/2 multiplex (2 commons)

- 1/3 multiplex (3 commons)

- 1/4 multiplex (4 commons)

• Segment pins up to:

- 64 (PIC16(L)F1946/47)

• Static, 1/2 or 1/3 LCD Bias

27.1

LCD Registers

The module contains the following registers:

• LCD Control register (LCDCON)

• LCD Phase register (LCDPS)

• LCD Reference Ladder register (LCDRL)

• LCD Contrast Control register (LCDCST)

• LCD Reference Voltage Control register

(LCDREF)

• Up to 6 LCD Segment Enable registers (LCDSEn)

• Up to 24 LCD data registers (LCDDATAn)

FIGURE 27-1:

LCD DRIVER MODULE BLOCK DIAGRAM

Data Bus

SEG<23:0>

To I/O Pads(1)

LCDDATAx

Registers

Note 1:

These are not directly connected to the I/O pads, but may be tri-stated, depending on the configuration of

the LCD module.

COM<3:0>

Clock Source

Timing Control

Select and

Prescaler

LFINTOSC

FOSC/256

T1OSC

To I/O Pads(1)

LCDCON

LCDPS

LCDSEn

MUX

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