ATMEGA3290P-20AUR Atmel, ATMEGA3290P-20AUR Datasheet - Page 234
![MCU AVR 32K FLASH 20MHZ 64TQFP](/photos/6/70/67048/313-100-tqfp_sml.jpg)
ATMEGA3290P-20AUR
Manufacturer Part Number
ATMEGA3290P-20AUR
Description
MCU AVR 32K FLASH 20MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA3290P-20AUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
69
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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Price
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23.3.3
23.3.4
8021G–AVR–03/11
1/3 Duty and 1/3 Bias
1/4 Duty and 1/3 Bias
Figure 23-4. Driving a LCD with Two Common Terminals
1/3 bias is usually recommended for LCD with three common terminals (1/3 duty). Waveform is
shown in
COM1 is the voltage across a segment that is off.
Figure 23-5. Driving a LCD with Three Common Terminals
1/3 bias is optimal for LCD displays with four common terminals (1/4 duty). Waveform is shown
in
the voltage across a segment that is off.
Figure
-
-
2
1
2
1
2
1
1
2
-1
1
1
/
/
/
/
/
/
/
/
3
3
3
3
3
3
3
3
-V
/
/
/
V
V
V
GND
V
V
V
GND
V
V
V
GND
V
V
2
2
2
-V
V
V
V
V
V
V
GND
GND
GND
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
23-6. SEG0 - COM0 is the voltage across a segment that is on and SEG0 - COM1 is
Figure
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Frame
Frame
23-5. SEG0 - COM0 is the voltage across a segment that is on and SEG0-
Frame
Frame
SEG0
COM0
SEG0 - COM0
SEG0
COM0
SEG0 - COM0
-
-
-1
2
1
2
1
2
1
1
2
1
1
/
/
/
/
/
/
/
/
3
3
3
3
3
3
3
3
/
/
/
-V
2
2
2
V
V
V
V
V
V
V
V
V
V
V
GND
GND
GND
-V
V
GND
V
V
GND
V
V
GND
V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
ATmega329P/3290P
Frame
Frame
Frame
Frame
SEG0
COM1
SEG0 - COM1
SEG0
COM1
SEG0 - COM1
234
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