ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 54
ATMEGA644A-MU
Manufacturer Part Number
ATMEGA644A-MU
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MU
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-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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10.1.4
10.1.5
8272A–AVR–01/10
Brown-out Detection
Watchdog Reset
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P has an On-chip Brown-out Detec-
tion (BOD) circuit for monitoring the V
level. The trigger level for the 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 on page
trigger level (V
out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 10-5. Brown-out Reset During Operation
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 62
Figure 10-6. Watchdog Reset During Operation
164A/164PA/324A/324PA/644A/644PA/1284/1284P
for details on operation of the Watchdog Timer.
BOD
CC
TOUT
given in
54), the Brown-out Reset is immediately activated. When V
BOT+
INTERNAL
TIME-OUT
has expired.
RESET
RESET
in
V
CC
Figure 10-5 on page
”System and Reset Characteristics” on page
BOT+
= V
CC
BOT
decreases to a value below the trigger level (V
CC
V
CK
+ V
BOT-
level during operation by comparing it to a fixed trigger
HYST
54), the delay counter starts the MCU after the Time-
CC
/2 and V
if the voltage stays below the trigger level for lon-
BOT-
= V
V
t
TOUT
BOT
BOT+
- V
335.
HYST
CC
/2.
increases above the
TOUT
BOT-
. Refer to
in
Figure
54
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