Rainbow Electronics ATmega3290P_V - Manual (Page 226)

226
ATmega329/3290/649/6490
2552H–AVR–11/06
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 105.
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
2c 2e
2f
2d
2g
COM3
COM0 COM1 COM2
SEG0
SEG1
SEG2
1b,1c
2c
2f
2a
2d
2g
2b
2e
..
COM
2
SEG0
SEG1
SEG2
ATmega329
COM
1
COM
0
Connection table
LCD
51 50 49
48
47
46
45