ATMEGA649V-8AUR Atmel, ATMEGA649V-8AUR Datasheet - Page 43
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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10.4
10.5
2552K–AVR–04/11
External Reset
Brown-out Detection
Figure 10-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
delay counter starts the MCU after the Time-out period – t
Figure 10-4. External Reset During Operation
ATmega329/3290/649/6490 has an On-chip Brown-out Detection (BOD) circuit for monitoring
the V
BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure
spike free Brown-out Detection. The hysteresis on the detection level should be interpreted as
V
When the BOD is enabled, and V
10-5), the Brown-out Reset is immediately activated. When V
level (V
expired.
The BOD circuit will only detect a drop in V
ger than t
BOT+
INTERNAL
TIME-OUT
CC
= V
BOT+
RESET
RESET
level during operation by comparing it to a fixed trigger level. The trigger level for the
BOD
BOT
V
CC
CC
in
+ V
given in
Figure
HYST
/2 and V
10-5), the delay counter starts the MCU after the Time-out period t
“System and Reset Characteristics” on page
V
“System and Reset Characteristics” on page
POT
BOT-
CC
= V
decreases to a value below the trigger level (V
BOT
- V
CC
HYST
ATmega329/3290/649/6490
if the voltage stays below the trigger level for lon-
V
RST
/2.
t
TOUT
TOUT
– has expired.
CC
RST
increases above the trigger
330.
– on its positive edge, the
330) will generate a
BOT-
in
TOUT
Figure
has
43
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