SAM7L128 Atmel Corporation, SAM7L128 Datasheet - Page 500
SAM7L128
Manufacturer Part Number
SAM7L128
Description
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
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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
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