ATxmega128B3 Atmel Corporation, ATxmega128B3 Datasheet - Page 305

• Manufacturer Part Number: ATxmega128B3
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B3

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 100
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

24.4.3
Figure 24-5. Driving an LCD With Three Common Terminals
24.4.4
Figure 24-6. Driving an LCD With Four Common Terminals
8291A–AVR–10/11
-1/3 V
-2/3 V
2/3 V
1/3 V
2/3 V
1/3 V
2/3 V
1/3 V
- V
GND
GND
GND
V
V
V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
1/3 Duty and 1/3 Bias
1/4 Duty and 1/3 Bias
Frame
1/3 bias is usually recommended for an LCD with three common terminals (1/3 duty). The wave-
form is shown in
“ON” and SEG0-COM1 is the voltage across a segment that is “OFF”.
1/3 bias is optimal for an LCD displays with four common terminals (1/4 duty). The waveform is
shown in
and SEG0-COM1 is the voltage across a segment that is “OFF”.
Figure 24-6 on page
Frame
Figure 24-5 on page
SEG0
COM0
SEG0-COM0
305. SEG0-COM0 is the voltage across a segment that is ON”
-1/3 V
-2/3 V
305. SEG0-COM0 is the voltage across a segment that is
2/3 V
1/3 V
2/3 V
1/3 V
2/3 V
1/3 V
- V
GND
GND
GND
V
V
V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Frame
Atmel AVR XMEGA B
Frame
SEG0
COM1
SEG0-COM1
305