Rainbow Electronics Atmega169L - Manual (Page 215)

215
ATmega169V/L
2514A–AVR–08/02
LCD Usage
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 103.
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: 3.3 ± 0.9 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
ATmega169
COM
1
COM
0
Connection table
LCD
51 50 49
48
47
46
45