Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 215)

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101

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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

2c2e

COM3

COM0 COM1 COM2

SEG0

SEG1

SEG2

1b,1c

COM2

SEG0

SEG1

SEG2

ATmega169

COM1

COM0

Connection table

LCD

51 50 49

1 2 ... 210 211 212 213 214 215 216 217 218 219 220 ... 316 317

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 215

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