Rainbow-electronics ATmega3290P_V Manuel d'utilisateur télécharger pdf (Page 226)

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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

2c2e

COM3

COM0 COM1 COM2

SEG0

SEG1

SEG2

1b,1c

COM2

SEG0

SEG1

SEG2

ATmega329

COM1

COM0

Connection table

LCD

51 50 49

1 2 ... 221 222 223 224 225 226 227 228 229 230 231 ... 374 375

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