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ATmega169P 数据表(PDF) 236 Page - ATMEL Corporation |
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ATmega169P 数据表(HTML) 236 Page - ATMEL Corporation |
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236 / 393 page  236 8018N–AVR–08/09 ATmega169P 23.2.8 Minimizing Power Consumption By keeping the percentage of the time the LCD drivers are turned on at a minimum, the power consumption of the LCD driver can be minimized. This can be achieved by using the lowest acceptable frame rate, and using low power waveform if possible. The drive time should be kept at the lowest setting that achieves satisfactory contrast for a particular display, while allowing some headroom for production variations between individual LCD drivers and displays. Note that some of the highest LCD voltage settings may result in high power consumption when V CC is below 2.0V. The recommended maximum LCD voltage is 2*(V CC - 0.2V). 23.3 Mode of Operation 23.3.1 Static Duty and Bias If all segments on a LCD have one electrode common, then each segment must have a unique terminal. This kind of display is driven with the waveform shown in Figure 23-3. SEG0 - COM0 is the volt- age across a segment that is on, and SEG1 - COM0 is the voltage across a segment that is off. Figure 23-3. Driving a LCD with One Common Terminal 23.3.2 1/2 Duty and 1/2 Bias For LCD with two common terminals (1/2 duty) a more complex waveform must be used to indi- vidually control segments. Although 1/3 bias can be selected 1/2 bias is most common for these displays. Waveform is shown in Figure 23-4. SEG0 - COM0 is the voltage across a segment that is on, and SEG0 - COM1 is the voltage across a segment that is off. VLCD GND VLCD GND VLCD GND -VLCD SEG0 COM0 SEG0 - COM0 Frame Frame VLCD GND VLCD GND GND SEG1 COM0 SEG1 - COM0 Frame Frame |
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