AT91SAM7L64-AU Atmel, AT91SAM7L64-AU Datasheet - Page 500

• 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

34.5.2.7
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