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ATATMEGA645P Datasheet(PDF) 5 Page - ATMEL Corporation

Part # ATATMEGA645P
Description  8-bit Atmel Microcontroller with 16/32/64K Bytes In-System Programmable Programmable
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATATMEGA645P Datasheet(HTML) 5 Page - ATMEL Corporation

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8285DS–AVR–06/11
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
The ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P provides the
following features: 16K/32K/64K bytes of In-System Programmable Flash with Read-While-Write
capabilities, 512/1K/2K bytes EEPROM, 1K/2K/4K byte SRAM, 54/69 general purpose I/O lines,
32 general purpose working registers, a JTAG interface for Boundary-scan, On-chip Debugging
support and programming, three flexible Timer/Counters with compare modes, internal and
external interrupts, a serial programmable USART, Universal Serial Interface with Start Condi-
tion Detector, an 8-channel, 10-bit ADC, a programmable Watchdog Timer with internal
Oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode
stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to con-
tinue functioning. The Power-down mode saves the register contents but freezes the Oscillator,
disabling all other chip functions until the next interrupt or hardware reset. In Power-save mode,
the asynchronous timer continues to run, allowing the user to maintain a timer base while the
rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O mod-
ules except asynchronous timer and ADC, to minimize switching noise during ADC conversions.
In Standby mode, the crystal/resonator Oscillator is running while the rest of the device is sleep-
ing. This allows very fast start-up combined with low-power consumption.
Atmel offers the QTouch® library for embedding capacitive touch buttons, sliders and wheels
functionality into AVR microcontrollers. The patented charge-transfer signal acquisition offers
robust sensing and includes fully debounced reporting of touch keys and includes Adjacent Key
Suppression® (AKS) technology for unambiguous detection of key events. The easy-to-use
QTouch Suite toolchain allows you to explore, develop and debug your own touch applications.
The device is manufactured using Atmel’s high density non-volatile memory technology. The
On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI
serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot pro-
gram running on the AVR core. The Boot program can use any interface to download the
application program in the Application Flash memory. Software in the Boot Flash section will
continue to run while the Application Flash section is updated, providing true Read-While-Write
operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a
monolithic chip, the Atmel devise is a powerful microcontroller that provides a highly flexible and
cost effective solution to many embedded control applications.
The ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P AVR is sup-
ported with a full suite of program and system development tools including: C Compilers, Macro
Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and Evaluation kits.


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