Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Data Sheet
Product codes
ATSAM4L-XPRO
1037
42023E–SAM–07/2013
ATSAM4L8/L4/L2
Figure 39-6. Driving a LCD With Three Common Lines
39.6.2.4
1/4 Duty and 1/3 Bias
1/3 bias is optimal for LCD with four common terminals (1/4 duty). SEG0-COM0 is the voltage
across a segment that is ON and SEG0-COM1 is the voltage across a segment that is OFF.
across a segment that is ON and SEG0-COM1 is the voltage across a segment that is OFF.
Figure 39-7. Driving a LCD With Four Common Lines
39.6.3
Enabling/Disabling LCDCA
Write bit Enable (EN) to one in Control Register (CR) to enable the module. Write bit Disable
(DIS) to one to disable it. LCD controller will be disabled after the completion of current frame.
Bit Enable in Status Register (SR.EN) is set to one when LCD controller is ready to operate and
set to zero when LCD power supply is off.
(DIS) to one to disable it. LCD controller will be disabled after the completion of current frame.
Bit Enable in Status Register (SR.EN) is set to one when LCD controller is ready to operate and
set to zero when LCD power supply is off.
SEG0-COM0
Frame
Frame
V
LCD
SEG0
COM0
2/3 V
LCD
GND
1/3 V
LCD
V
LCD
2/3 V
LCD
GND
1/3 V
LCD
V
LCD
2/3 V
LCD
GND
1/3 V
LCD
-1/3 V
LCD
-2/3 V
LCD
- V
LCD
Frame
Frame
V
LCD
SEG0
COM1
2/3 V
LCD
GND
1/3 V
LCD
V
LCD
2/3 V
LCD
GND
1/3 V
LCD
V
LCD
2/3 V
LCD
GND
1/3 V
LCD
-1/3 V
LCD
-2/3 V
LCD
- V
LCD
SEG0-COM1