AT91SAM7L64-AU Atmel, AT91SAM7L64-AU Datasheet - Page 491

• Manufacturer Part Number: AT91SAM7L64-AU
• Description: MCU ARM7 64K HS FLASH 128-LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7L64-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 36MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 6K x 8
• Voltage - Supply (vcc/vdd): 1.55 V ~ 1.8 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 128-LQFP
• Controller Family/series: AT91SAM7xxx
• No. Of I/o's: 80
• Ram Memory Size: 6KB
• Cpu Speed: 36MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Processor Series: AT91SAMx
• Core: ARM7TDMI
• Data Bus Width: 32 bit
• Data Ram Size: 6 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 36 MHz
• Number Of Programmable I/os: 80
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91SAM-ICE, AT91-ISP, AT91SAM7L-EK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 4 Channel
• For Use With: AT91SAM7L-STK - KIT EVAL FOR AT91SAM7LAT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

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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