PIC16F193X Datasheet, PDF (243/418 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F193X/LF193X
21.0 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 PIC16F193X/LF193X
device, the module drives the panels of up to four
commons and up to 24 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:
- 16 (PIC16F1933/1936/1938/
PIC16LF1933/1936/1938)
- 24 (PIC16F1934/1937/1939/
PIC16LF1934/1937/1939)
• Static, 1/2 or 1/3 LCD Bias
Note:
COM3 and SEG15 share the same physical
pin on the PIC16F1933/1936/1938/
PIC16LF1933/1936/1938, therefore SEG15
is not available when using 1/4 multiplex
displays.
21.1 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 3 LCD Segment Enable registers (LCDSEn)
• Up to 12 LCD data registers (LCDDATAn)
FIGURE 21-1:
LCD DRIVER MODULE BLOCK DIAGRAM
Data Bus
LCDDATAx
Registers
MUX
SEG<23:0>^{(1, 3)}
To I/O Pads⁽¹⁾
Timing Control
LCDCON
LCDPS
LCDSEn
COM<3:0>⁽³⁾
To I/O Pads⁽¹⁾
FOSC/256
T1OSC
LFINTOSC
Clock Source
Select and
Prescaler
Note 1:
2:
3:
These are not directly connected to the I/O pads, but may be tri-stated, depending on the configuration of
the LCD module.
SEG<23:0> on PIC16F1934/1937/1939, SEG<15:0> on PIC16F1933/1936/1938/
PIC16LF1933/1936/1938.
COM3 and SEG15 share the same physical pin on the PIC16F1933/1936/1938/PIC16LF1933/1936/1938,
therefore SEG15 is not available when using 1/4 multiplex displays.
© 2008 Microchip Technology Inc.
Preliminary
DS41364A-page 241