ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 301

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• 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: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

24. LCD - Liquid Crystal Display
24.1
24.2
8291A–AVR–10/11
Features
Overview
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
An LCD display is made of several segments (pixels or complete symbols) which can be visible
or invisible. A segment has two electrodes with liquid crystal between them. These electrodes
are the common terminal (COM pin) and the segment terminal (SEG pin). When a voltage above
a threshold voltage is applied across the liquid crystal, the segment becomes visible. The volt-
age must alternate to avoid an electrophoresis effect in the liquid crystal, this effect degrades the
display. Hence the voltage waveform across a segment must not have a DC-component.
The LCD controller is intended for monochrome passive liquid crystal display (LCD) with up to 4
Common terminals and up to 40 Segments terminals. If the application does not need all the
LCD segments available on the XMEGA, up to 16 of the unused LCD pins can be used as gen-
eral purpose I/O pins.
The LCD controller can be clocked by an internal or an external asynchronous 32kHz clock
source. This 32kHz oscillator source selection is the same as for the Real Time Counter (RTC).
Dedicated Low Power Waveform, Contrast Control, Extended Interrupt Mode, Selectable Frame
Frequency and Blink functionality are supported to offload the CPU, reduce interrupts and
reduce power consumption.
To reduce hardware design complexity, the LCD includes integrated LCD buffers, an integrated
power supply voltage and an innovative SWAP mode. Using SWAP mode, the hardware design-
ers have more flexibility during board layout as they can rearrange the pin sequence on
Segment and/or Common Terminal Buses.
Display Capacity up to 40 Segment and up to 4 Common Terminals
Supports up to 16 GPIO's
Shadow Display Memory Gives Full Freedom in Segment Update
ASCII Character Mapping
Swap Capability Option on Common and/or Segment Terminal Buses
Supports from Static up to 1/4 Duty
Supports Static and 1/3 Bias
LCD Driver Active in Power Save Mode for Low Power Operation
Software Selectable Low Power Waveform
Flexible Selection of Frame Frequency
Programmable Blink Mode and Frequency
Blink on two Segment Terminals
Uses Only 32kHz RTC Clock Source
On-chip LCD Power Supply
Software Contrast Adjustment Control
Equal Source and Sink Capability to Increase LCD Life Time
Extended Interrupt Mode for Display Update or Wake-up from Sleep Mode
Atmel AVR XMEGA B
301