Datasheet

227
ATmega329/3290/649/6490
2552I–AVR–04/07
LCD Usage The following section describes how to use the LCD.
LCD Initialization Prior to enabling the LCD some initialization must be preformed. The initialization pro-
cess normally consists of setting the frame rate, duty, bias and port mask. LCD contrast
is set initially, but can also be adjusted during operation.
Consider the following LCD as an example:
Figure 104.
Display: TN Positive, Reflective
Number of common terminals: 3
Number of segment terminals: 21
Bias system: 1/3 Bias
Drive system: 1/3 Duty
Operating voltage: 3.0 ± 0.3 V
1b
1c
2a
2b
2c2e
2f
2d
2g
COM3
COM0 COM1 COM2
SEG0
SEG1
SEG2
1b,1c
2c
2f
2a
2d
2g
2b
2e
..
COM2
SEG0
SEG1
SEG2
ATmega329
COM1 COM0
Connection table
LCD
51 50 49
48
47
46
45