ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 53
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-20AU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Manufacturer
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8.5
8.6
8011O–AVR–07/10
Brown-out Detection
Watchdog Reset
ATmega164P/324P/644P has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
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
V
When the BOD is enabled, and V
8-5 on page
trigger level (V
out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 8-5.
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 61
Figure 8-6.
CC
BOT
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD
+ V
for details on operation of the Watchdog Timer.
HYST
BOD
CC
TOUT
53), the Brown-out Reset is immediately activated. When V
/2 and V
given in
Brown-out Reset During Operation
Watchdog Reset During Operation
BOT+
INTERNAL
TIME-OUT
has expired.
RESET
RESET
in
V
CC
BOT-
Figure 8-5 on page
”System and Reset Characteristics” on page
= V
BOT
- V
CC
HYST
decreases to a value below the trigger level (V
V
CK
BOT-
/2.
53), the delay counter starts the MCU after the Time-
CC
if the voltage stays below the trigger level for lon-
ATmega164P/324P/644P
V
t
TOUT
BOT+
331.
CC
increases above the
TOUT
BOT-
. Refer to
in
Figure
BOT+
53
=
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