User`s guide
As for LCD, we have allowed GLCD back-light to be enabled in two
dierent ways:
1. It can be turned on with full brightness using SW4.6 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 SW4.5 switch.
Graphical Liquid Crystal Displays, or GLCDs are used to
display monochromatic graphical content, such as text, images,
human-machine interfaces and other content. EasyPIC
™
v7
provides the connector and necessary interface for supporting
GLCD with resolution of 128x64 pixels, driven by the KS108 or
compatible display controller. Communication with the display
module is done through CN6 display connector. Board is tted
with uniquely designed plastic display distancer, which allows
the GLCD module to perfectly and rmly t into place.
Display connector is routed to PORTB
(control lines) and PORTD (data lines) of the
microcontroller sockets. Since the same ports are
used by 2x16 character LCD display, you cannot
use both displays simultaneously. You can control
the display contrast using dedicated potentiometer
P3. Full brightness display back light can be enabled
with SW4.5 switch, and PWM-driven back light with
SW4.6 switch.
GLCD 128x64
VCC-5V
P3
10K
Q11
BC846
R92
20
R89
4K7
R10
1K
VCC-MCU
CS1
CS2
GND
Vcc
Vo
RS
R/W
D1
D2
D3
D4
D5
D6
D7
E
D0
RST
Vee
LED+
LED-
1 20
CN6
GLCD SOCKET2
RD0
RD1
RD2
RD3
RD4
RD5
RD6
RD7
RB4
RB2
RB5
RB3
RB1
RB0
Vo
LCD-GLCD BCK
K-GLCD
LCD-GLCD BCK
1 2 3 4 5 6 7 8
O
N
SW4
LCD-GLCD BPWM RC2
VCC-5V
DATA BUS
displays
Figure 12-1: GLCD 128x64
connection schematic
Standard and PWM-driven back-light
Connector pinout explained
In order to use PWM back-light both SW4.5 and SW4.6 switches must
be enabled at the same time.
IMPORTANT:
CS1 and CS2 - Controller Chip Select lines
VCC - +5V display power supply
GND - Reference ground
Vo - GLCD contrast level from potentiometer P3
RS - Data (High), Instruction (Low) selection line
R/W - Determines whether display is in Read or
Write mode.
E - Display Enable line
D0–D7 - Data lines
RST - Display reset line
Vee - Reference voltage for GLCD contrast
potentiometer P3
LED+ - Connection with the back-light LED anode
LED- - Connection with the back-light LED cathode
page 25