Lcd 2X16 Characters - mikroElektronika EasyAVR v7 User Manual

IMPORTANT:
VCC-5V
P2
10K
VCC-5V
page 20

LCD 2x16 characters

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. EasyAVR 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 CN8 display connector. Board is fitted with uniquely
designed plastic display distancer, which allows the LCD module
to perfectly and firmly fit into place.
Make sure to turn off the power supply before placing LCD onto
the board. Otherwise your display can be permanently damaged.
VCC-BRD
R32
Q5
56
R36
BC846
1K
R37
4K7
Figure 10-2: 2x16 LCD
connection schematic
CN8
LCD SOCKET
Figure 10-1: On-board LCD 2x16 display connector
Connector pinout explained
GND and VCC
Vo
- LCD contrast level from potentiometer P2
RS
- Register Select Signal line
VCC-5V
BCK LIGHT E - Display Enable line
BCK PWM PD5
R/W
always connected to GND, leaving the display in Write mode all
the time.
D0–D3
the data byte interface is connected to GND.
SW3
D4–D7
DATA BUS
LED+
LED-
Standard and PWM-driven back-light
We have allowed LCD back-light to be enabled in two different
ways:
1. It can be turned on with full brightness using SW3.1 switch.
2. Brightness level can be determined with PWM signal from the
microcontroller, allowing you to write custom back-light controlling
software. This back-light mode is enabled with SW3.2 switch.
IMPORTANT:
In order to use PWM back-light both SW3.1 and SW3.2 switches must
be enabled at the same time.
- Display power supply lines
- Determines whether display is in Read or Write mode. It's
- Display is supported in 4-bit data mode, so lower half of
- Upper half of the data byte
- Connection with the back-light LED anode
- Connection with the back-light LED cathode
EasyAVR
v7