SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 500

• 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

34.5.2.7
34.5.3
500
AT91SAM7L128/64 Preliminary
Number of Commons, Segments and Bias
Buffer Driving Time
Table 34-3.
Intermediate voltage levels are generated from buffer drivers. The buffers are active the amount
of time specified by BUFTIME[3:0] in SLCDC_MR, then buffers are bypassed.
Shortening the drive time will reduce power consumption, but displays with high internal resis-
tance or capacitance may need longer drive time to achieve sufficient contrast.
Example for bias = 1/3.
Figure 34-8. Buffer Driving
It is important to note that the selection of the number of commons, segments and the bias is
only taken into account when the SLCDC is disabled.
NCOM
Number of Commons
10
1
2
3
4
5
6
7
8
9
SLCDC_MR
V
LCD
R
R
R
BUFFTIME
2/3 V
1/3 F
LCD
LCD
NCOM
16
16
15
16
15
18
14
16
18
20
6257A–ATARM–20-Feb-08