SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 491

• Manufacturer Part Number: SAM7L128
• Manufacturer: Atmel Corporation

Specifications of SAM7L128

• Flash (kbytes): 128 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 36 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 80
• Ext Interrupts: 80
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Segment Lcd: 40
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 460
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 6
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.8 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

34. Segment LCD Controller (SLCDC)
34.1
6257A–ATARM–20-Feb-08
Overview
An LCD consists of several segments (pixels or complete symbols) which can be visible or invis-
ible. A segment has two electrodes with liquid crystal between them. When a voltage above a
threshold voltage is applied across the liquid crystal, the segment becomes visible.
The voltage must alternate to avoid an electrophoresis effect in the liquid crystal, which
degrades the display. Hence the waveform across a segment must not have a DC component.
The SLCDC controller is intended for monochrome passive liquid crystal display (LCD) with up
to 10 common terminals and up to 40 segment terminals.
The SLCDC is programmable to support many different requirements such as:
.
Table 34-1.
Term
LCD
Segment
Common(s)
Duty
Bias
Frame Rate
• Adjusting the driving time of the LCD pads in order to save power and increase the
• Driving smaller LCD (down to 1 common by 1 segment)
• Adjusting the SLCDC frequency in order to obtain the best compromise between frequency
controllability of the DC offset
and consumption and adapt it to the LCD driver
List of Terms
Description
A passive display panel with terminals leading directly to a segment
The least viewing element (pixel) which can be on or off
Denotes how many segments are connected to a segment terminal
1/(Number of common terminals on an actual LCD display)
1/(Number of voltage levels used driving a LCD display -1)
Number of times the LCD segments are energized per second.
AT91SAM7L128/64 Preliminary
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