SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 496

• 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

34.5.2
34.5.2.1
34.5.2.2
496
AT91SAM7L128/64 Preliminary
Waveform Generation
Static Duty and Bias
1/2 Duty and 1/2 Bias
This kind of display is driven with the waveform shown in
age across a segment that is on, and SEG1 - COM0 is the voltage across a segment that is off.
Figure 34-3. Driving an LCD with One Common Terminal
For an LCD with two common terminals (1/2 duty) a more complex waveform must be used to
control segments individually. Although 1/3 bias can be selected, 1/2 bias is most common for
these displays. In the waveform shown in
segment that is on, and SEG0 - COM1 is the voltage across a segment that is off.
Figure 34-4. Driving an LCD with Two Common Terminals
-1
1
1
V
GND
V
GND
V
GND
-V
/
/
/
2
2
2
-V
LCD
LCD
LCD
V
GND
V
V
GND
V
V
GND
V
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Frame Frame
Frame
Frame
SEG0
COM0
SEG0 - COM0
SEG0
COM0
SEG0 - COM0
Figure
34-4, SEG0 - COM0 is the voltage across a
-1
1
1
V
GND
V
GND
GND
/
/
/
2
2
2
-V
LCD
LCD
V
V
V
V
V
V
GND
GND
GND
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Figure
Frame Frame
Frame Frame
34-3. SEG0 - COM0 is the volt-
6257A–ATARM–20-Feb-08
SEG1
COM0
SEG1 - COM0
SEG0
COM1
SEG0 - COM1