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ATmega3290P Datasheet(PDF) 232 Page - ATMEL Corporation

Part # ATmega3290P
Description  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  385 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega3290P Datasheet(HTML) 232 Page - ATMEL Corporation

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232
8021E–AVR–07/09
ATmega329P/3290P
Figure 22-6. Driving a LCD with Four Common Terminals
22.3.5
Low Power Waveform
To reduce toggle activity and hence power consumption a low power waveform can be selected
by writing LCDAB to one. Low power waveform requires two subsequent frames with the same
display data to obtain zero DC voltage. Consequently data latching and Interrupt Flag is only set
every second frame. Default and low power waveform is shown in Figure 22-7 for 1/3 duty and
1/3 bias. For other selections of duty and bias, the effect is similar.
Figure 22-7. Default and Low Power Waveform
22.3.6
Operation in Sleep Mode
When synchronous LCD clock is selected (LCDCS = 0) the LCD display will operate in Idle
mode and Power-save mode with any clock source.
An asynchronous clock from TOSC1 can be selected as LCD clock by writing the LCDCS bit to
one when Calibrated Internal RC Oscillator is selected as system clock source. The LCD will
then operate in Idle mode, ADC Noise Reduction mode and Power-save mode.
When EXCLK in ASSR Register is written to one, and asynchronous clock is selected, the exter-
nal clock input buffer is enabled and an external clock can be input on Timer Oscillator 1
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM0
SEG0 - COM0
Frame
Frame
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM1
SEG0 - COM1
Frame
Frame
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM0
SEG0 - COM0
Frame
Frame
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
VLCD
2/
3VLCD
1/
3VLCD
GND
-1/3VLCD
-2/3VLCD
-VLCD
SEG0
COM0
SEG0 - COM0
Frame
Frame



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