ATMEGA3290P_14 Datasheet, PDF (237/427 Pages) ATMEL Corporation – High Endurance Non-volatile Memory segments

ATmega329P/3290P
23.4 LCD Usage
23.4.1
The following section describes how to use the LCD.
LCD Initialization
Prior to enabling the LCD some initialization must be preformed. The initialization process nor-
mally 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 23-8.
LCD
2a
1b
2f
2b
2g
1c
2e
2c
2d
51 50 49
COM3 48
SEG0 47
ATmega329
SEG1 46
SEG2 45
SEG2
SEG1
SEG0
2f
2c
1b,1c
COM0
2g
2d
2a
COM1
..
2e
2b
COM2
Connection table
8021G–AVR–03/11
Display:
Number of common terminals:
Number of segment terminals:
Bias system:
Drive system:
Operating voltage:
TN Positive, Reflective
3
21
1/3 Bias
1/3 Duty
3.0 ± 0.3 V
237