mikroElektronika EasyPIC PRO v7, User Manual

Page: 26 / 41

Liquid Crystal Displays or LCDs are cheap and
popular way of representing information to the
end user of some electronic device. Character
LCDs can be used to represent standard and
custom characters in the predefined number of
fields. EasyPIC PRO
™
v7 provides the connector
and the necessary interface for supporting 2x16
character LCDs
in 4-bit mode. This type of display has
two rows consisted of 16 character fields. Each field is a
7x5 pixel matrix. Communication with the display module
is done through
CN14
display connector. Board is fitted with
uniquely designed plastic display distancer, which allows the LCD
module to perfectly and firmly fit into place.
GND and VCC - Display power supply lines
Vo - LCD contrast level from potentiometer P1
RS
- Register Select Signal line
E - Display Enable line
R/W - Determines whether display is in Read or Write mode. It’s
always connected to GND, leaving the display in Write mode all
the time.
D0–D3 - Display is supported in 4-bit data mode, so lower half of
the data byte interface is connected to GND.
D4–D7 - Upper half of the data byte
LED+ - Connection with the backlight LED anode
LED-
- Connection with the backlight LED cathode
We have allowed LCD backlight to be enabled in two different ways:
1. It can be turned on with full brightness using SW4.1 switch.
2. Brightness level can be determined with PWM signal from the
microcontroller, allowing you to write custom backlight controling
software. This backlight mode is enabled with
SW4.3 switch.
LCD 2x16 characters
D
AT
A BUS
Figure 12-1: On-board LCD 2x16 display connector
Figure 12-2: 2x16 LCD
connection schematics
Standard and PWM-driven backlight
Connector pinout explained
Make sure to turn off the power supply before placing LCD onto
the board. Otherwise your display can be permanently damaged.
In order to use PWM backlight both
SW4.1
and
SW4.3
switches must be
enabled at the same time.
IMPORTANT:
IMPORTANT:
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displa
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Easy PIC PRO
v7