Microchip Technology ARD00385 Data Sheet
PIC18F87K90 FAMILY
DS39957D-page 284
2009-2011 Microchip Technology Inc.
20.3.2.2
Contrast Control
The LCD contrast control circuit consists of a 7-tap
resistor ladder, controlled by the LCDCST bits (see
resistor ladder, controlled by the LCDCST bits (see
.).
FIGURE 20-6:
INTERNAL REFERENCE AND CONTRAST CONTROL BLOCK DIAGRAM
LCDCST<2:0>
Analog
R
R
R
R
7 Stages
MUX
To Top of
Reference Ladder
Reference Ladder
7
0
3
V
DD
Internal Reference
Contrast Control