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ATmega169P 数据表(PDF) 241 Page - ATMEL Corporation |
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ATmega169P 数据表(HTML) 241 Page - ATMEL Corporation |
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241 / 393 page  241 8018N–AVR–08/09 ATmega169P 23.4 LCD Usage The following section describes how to use the LCD. 23.4.1 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 usage example. 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 .. SEG0 SEG1 SEG2 ATmega169 Connection table LCD 51 50 49 48 47 46 45 |
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