ATMEGA640 datasheet(6/436 Pages) MICROCHIP

6 / 436 page

ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

The ATmega640/1280/1281/2560/2561 provides the following features: 64K/128K/256K bytes of In-System Pro-

grammable Flash with Read-While-Write capabilities, 4Kbytes EEPROM, 8Kbytes SRAM, 54/86 general purpose

I/O lines, 32 general purpose working registers, Real Time Counter (RTC), six flexible Timer/Counters with com-

pare modes and PWM, four USARTs, a byte oriented 2-wire Serial Interface, a 16-channel, 10-bit ADC with

optional differential input stage with programmable gain, programmable Watchdog Timer with Internal Oscillator,

an SPI serial port, IEEE® std. 1149.1 compliant JTAG test interface, also used for accessing the On-chip Debug

system and programming and six software selectable power saving modes. The Idle mode stops the CPU while

allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue 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 sleeping. This allows very fast

start-up combined with low power consumption. In Extended Standby mode, both the main Oscillator and the

Asynchronous Timer continue to run.

Microchip offers the QTouch® library for embedding capacitive touch buttons, sliders and wheels functionality into

AVR microcontrollers. The patented charge-transfer signal acquisition offersrobust 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 the Microchip high-density nonvolatile memory technology. The On-chip ISP

Flash allows the program memory to be reprogrammed in-system through an SPI serial interface, by a conven-

tional nonvolatile memory programmer, or by an On-chip Boot program 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 ATmega640/1280/1281/2560/2561 is a powerful microcontroller that provides a highly flexible and cost

effective solution to many embedded control applications.

The ATmega640/1280/1281/2560/2561 AVR is supported with a full suite of program and system development

tools including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation

kits.

ATMEGA640 Datasheet(PDF) 6 Page - Microchip Technology