PIC18F87J90 Datasheet, PDF (183/450 Pages) Microchip Technology – 64/80-Pin, High-Performance Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F87J90 FAMILY
17.0 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. It also provides control of the
LCD pixel data. The module can drive panels of up to
192 pixels (48 segments by 4 commons) in
PIC18F8XJ90 devices and 132 pixels (33 segments by
4 commons) in PIC18F6XJ90 devices.
The LCD driver module supports these features:
• Direct driving of LCD panel
• On-chip bias generator with dedicated charge
pump to support a range of fixed and variable bias
options
• Up to four commons, with four Multiplexing modes
• Up to 48 (PIC18F8XJ90 devices) or 33
(PIC18F6XJ90 devices) segments
• Three LCD clock sources with selectable prescaler,
with a fourth source available for use with the LCD
charge pump
A simplified block diagram of the module is shown in
Figure 17-1.
FIGURE 17-1:
LCD DRIVER MODULE BLOCK DIAGRAM
Data Bus
8
LCD DATA
24 x 8 (= 4 x 48)
LCDDATA23
LCDDATA22
...
LCDDATA1
LCDDATA0
192
to
48
48
MUX
FOSC/4
T13CKI
INTRC Oscillator
INTOSC Oscillator
Timing Control
LCDCON
LCDPS
LCDSEx
LCD Clock
Source Select
Bias
Voltage
4
LCD Bias Generation
LCD
Charge Pump
SEG<47:0>
To I/O Pins
COM<3:0>
 2010 Microchip Technology Inc.
DS39933D-page 183