ATMEGA649V-8AUR Atmel, ATMEGA649V-8AUR Datasheet - Page 29
![IC AVR MCU FLASH 64K 1.8V 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA649V-8AUR
Manufacturer Part Number
ATMEGA649V-8AUR
Description
IC AVR MCU FLASH 64K 1.8V 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA329-16AU.pdf
(392 pages)
Specifications of ATMEGA649V-8AUR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
53
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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Price
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8.4
8.5
2552K–AVR–04/11
Low-frequency Crystal Oscillator
Calibrated Internal RC Oscillator
Table 8-4.
Note:
To use a 32.768kHz watch crystal as the clock source for the device, the low-frequency crystal
Oscillator must be selected by setting the CKSEL Fuses to “0110” or “0111”. The crystal should
be connected as shown in
mined by the SUT Fuses as shown in
Table 8-5.
Table 8-6.
Note:
The calibrated Internal RC Oscillator by default provides a 8.0MHz clock. The frequency is nom-
inal value at 3V and 25°C. The device is shipped with the CKDIV8 Fuse programmed. See
“System Clock Prescaler” on page 32
CKSEL0
CKSEL3..0
SUT1..0
0110
00
01
10
11
0111
0
1
1
1
1
(1)
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1. This option should only be used if frequency stability at start-up is not important for the
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
application
SUT1..0
Additional Delay from Reset (V
Start-up Times for the Crystal Oscillator Clock Selection (Continued)
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
11
00
01
10
11
Power-down and Power-save
Start-up Time from
Power-down and
14CK + 4.1ms
14CK + 65ms
Power-save
Figure
Start-up Time from
1K CK
1K CK
16K CK
16K CK
16K CK
14CK
32K CK
1K CK
8-2. When this Oscillator is selected, start-up times are deter-
(2)
(2)
Table 8-5
for more details.
CC
Reserved
ATmega329/3290/649/6490
= 5.0V)
Additional Delay
14CK + 4.1ms
14CK + 4.1ms
14CK + 65ms
14CK + 65ms
and CKSEL1..0 as shown in
(V
from Reset
CC
14CK
= 5.0V)
Recommended Usage
Fast rising power or BOD enabled
Slowly rising power
Stable frequency at start-up
Recommended Usage
Stable frequency at start-up
Recommended
Usage
Ceramic resonator,
fast rising power
Ceramic resonator,
slowly rising power
Crystal Oscillator,
BOD enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator,
slowly rising power
Table
8-6.
29
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