ATMEGA644A-AU Atmel, ATMEGA644A-AU Datasheet - Page 52
ATMEGA644A-AU
Manufacturer Part Number
ATMEGA644A-AU
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AU
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA644A-AU
Manufacturer:
Atmel
Quantity:
135
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10.1.2
8272A–AVR–01/10
Power-on Reset
Figure 10-1. Reset Logic
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
V
well as to detect a failure in supply voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
164A/164PA/324A/324PA/644A/644PA/1284/1284P
CC
is below the detection level. The POR circuit can be used to trigger the start-up Reset, as
BODLEVEL [2..0]
CC
decreases below the detection level.
”System and Reset Characteristics” on page
Pull-up Resistor
JTAG Reset
Register
FILTER
SPIKE
CC
CKSEL[3:0]
rise. The RESET signal is activated again, without any delay,
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
Circuit
Clock
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
335. The POR is activated whenever
TIMEOUT
52
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