ATxmega64B3 Atmel Corporation, ATxmega64B3 Datasheet - Page 308

• Manufacturer Part Number: ATxmega64B3
• Manufacturer: Atmel Corporation

Specifications of ATxmega64B3

• Flash (kbytes): 64 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

24.4.11
8291A–AVR–10/11
LCD Power Supply
The LCD power supply manages all voltages for LCD buffers. The XBIAS bit in the CTRLA reg-
ister defines the source of V
Reference. Otherwise, V
Note that when using external V
CRTLG register is inoperative.
Table 24-3.
Notes:
Figure 24-9. LCD Power Supply Block Diagram
Different application schemes for bias generation are shown in
ENABLE
BANDGAP
Reference
0
1
1. ENABLE and XBIAS bits of the CTRLA register.
(1)
LCD Power Supply Pins Behavior
XBIAS
Pump
x
0
1
(1)
Contrast
LCD
Input for V
VLCD (pin)
must be powered externally.
LCD
V
H.Z.
. If XBIAS is cleared, V
LCD
LCD
LCD
x1
, the fine contrast controlled by FCONT[5:0] bits of the
x2
- Input for BIAS2
- H.Z. if static bias
(also in static mode)
XBIAS
x3
2
BIAS2
/
3
H.Z.
V
LCD
Atmel AVR XMEGA B
LCD
sources voltages from the Bandgap
- Input for BIAS1
- H.Z. if static bias
(also in static mode)
Figure 24-10 on page
1
BIAS1
/
3
H.Z.
V
LCD
CAPH
CAPL
V
BIAS2
BIAS1
COMy
SEGx
LCD
CAPH / CAPL
Pump voltage
309.
H.Z.
H.Z.
308