ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 307

• 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

24.4.8
24.4.9
24.4.9.1
24.4.9.2
24.4.10
8291A–AVR–10/11
Display Blanking
Display Blinking
Extended Interrupt Mode
Hardware Blinking
Software Blinking
When BLANK is written to one, the LCD is blanked after the completion of the current frame. All
segment and common pins are driven to GND, discharging the LCD. Data in the Display Mem-
ory is preserved. Display blanking should be used before disabling the LCD to avoid DC voltage
across the segments, and a slowly fading image.
This mode differs from the one enabled by SEGON = 0 (in CTRLA register) where the segment
and common pins are always driven by the programmed waveform and where all the segments
are “OFF”.
There are two ways to blink the display, controlled from software and controlled automatically by
hardware.
Setting / clearing segment(s) in the Display Memory allows software blinking. To blink simultane-
ously all enabled segments, SEGON bit in CRTLA register can be used. The blink rate is
software dependant.
Up to eight segments (pixels) can be configured to automatically blink. These segments must be
connected to the segment terminal SEG1 and/or SEG0. This mode is enabled by setting the
BLINKEN bit in the CTRLD register and defining the associated common terminal(s) in the
CTRLE register.The blink rate frequency is configured by using the BLINKRATE bit-field in the
CTRLD register. A segment will blink if its corresponding bit is set in the Display Memory, other-
wise it will remain “OFF”.
If all bits in the CTRLE register are set to zero, then blinking is applied to all enabled segments.
The BLINK command will come into operation at the beginning of the next LCD frame.
Table 24-2.
Notes:
In standard interrupt mode (XIME[4:0]=0), the LCD controller can provide an interrupt every
frames. When the extended interrupt mode is enabled, the LCD controller can provide the inter-
rupt every XIME[4:0]+1 frames.
This mode provides an embedded time base for user. This time base can be used by the soft-
ware in charge of display updates (i.e. scrolling text, progress bar, ...).
The extended interrupt mode saves real time resources and allows the application to stay longer
in Power-save or Extended Standby mode.
SEGON
0
1
1
1. SEGON bit in CTRLA register.
(1)
BLINKEN
Blinking Modes
0
1
x
BPS1[3:0] | BPS0[3:0]
Not equal to zero
0
0
0
b
b
b
0000 0000
xxxx xxxx
xxxx xxxx
Comment
All segments are “OFF”
All segments are driven by the corresponding data
registers
All segments are blinking at the blink frequency
Blinking only the selected segment(s) at the blink
frequency
Atmel AVR XMEGA B
307