SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 498

• 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

34.5.2.4
Figure 34-6. Driving an LCD with Four Common Terminals
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2
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-V
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GND
GND
GND
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
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LCD
LCD
AT91SAM7L128/64 Preliminary
1/4 Duty and 1/3 Bias
Frame
1/3 bias is optimal for LCD displays with four common terminals (1/4 duty). In the waveform
shown in
COM1 is the voltage across a segment that is off.
Frame
Figure
34-6, SEG0 - COM0 is the voltage across a segment that is on and SEG0 -
SEG0
COM0
SEG0 - COM0
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3
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-V
V
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V
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V
GND
GND
GND
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
Frame
Frame
6257A–ATARM–20-Feb-08
SEG0
COM1
SEG0 - COM1