ATMEGA6490-16AI Atmel, ATMEGA6490-16AI Datasheet - Page 243
ATMEGA6490-16AI
Manufacturer Part Number
ATMEGA6490-16AI
Description
IC AVR MCU FLASH 64K 5V 100TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA329-16AU.pdf
(392 pages)
Specifications of ATMEGA6490-16AI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
68
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
For Use With
ATSTK600-TQFP100 - STK600 SOCKET/ADAPTER 100-TQFPATSTK504 - STARTER KIT AVR EXP MOD 100P LCD
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA6490-16AI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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23.4.4
2552K–AVR–04/11
LCDCCR – LCD Contrast Control Register
• Bits 7:5 – LCDDC2:0: LDC Display Configuration
The LCDDC2:0 bits determine the amount of time the LCD drivers are turned on for each volt-
age transition on segment and common pins. A short drive time will lead to lower power
consumption, but displays with high internal resistance may need longer drive time to achieve
satisfactory contrast. Note that the drive time will never be longer than one half prescaled LCD
clock period, even if the selected drive time is longer. When using static duty or blanking, drive
time will always be one half prescaled LCD clock period.
New values take effect immediately, and can cause small glitches in the display output. This can
be avoided by setting the LCDBL in LCDCRA, and wait to the next start of frame before chang-
ing LCDDC2:0.
Table 23-7.
Note:
• Bit 4 – Reserved Bit
This bit is reserved in the ATmega329/3290/649/6490 and will always read as zero.
• Bits 3:0 – LCDCC3:0: LCD Contrast Control
The LCDCC3:0 bits determine the maximum voltage V
different selections are shown in
frame.
Table 23-8.
Bit
(0xE7)
Read/Write
Initial Value
LCDCC3
LCDDC2
0
0
0
0
The drive time will be longer dependent on oscillator startup time.
0
0
0
0
1
1
1
1
LCDDC2
R/W
7
0
LCD Display Configuration
LCD Contrast Control
LCDCC2
LCDDC1
0
0
0
0
R/W
6
0
LCDDC1
0
0
1
1
0
0
1
1
LCDDC0
R/W
5
0
LCDCC1
Table
0
0
1
1
R
4
0
23-8. New values take effect every beginning of a new
–
LCDDC0
ATmega329/3290/649/6490
LCDCC3
LCDCC0
0
1
0
1
0
1
0
1
R/W
3
0
0
1
0
1
LCDCC2
LCD
R/W
2
0
on segment and common pins. The
Maximum Voltage V
Nominal drive time
300µs
70µs
150µs
450µs
575µs
850µs
1150µs
50% of clk
LCDCC1
R/W
0
1
2.60
2.65
2.70
2.75
LCDCC0
LCD_PS
R/W
0
0
LCDCCR
LCD
243
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