ATMEGA640 datasheet(10/436 Pages) MICROCHIP

10 / 436 page

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

DS40002211A

3. Resources

A comprehensive set of development tools and application notes, and datasheets are available for download on

http://www.atmel.com/avr.

4. About Code Examples

This documentation contains simple code examples that briefly show how to use various parts of the device. Be

aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is com-

piler dependent. Confirm with the C compiler documentation for more details.

These code examples assume that the part specific header file is included before compilation. For I/O registers

located in extended I/O map, "IN", "OUT", "SBIS", "SBIC", "CBI", and "SBI" instructions must be replaced with

instructions that allow access to extended I/O. Typically "LDS" and "STS" combined with "SBRS", "SBRC", "SBR",

and "CBR".

5. Data Retention

Reliability Qualification results show that the projected data retention failure rate is much less than 1 ppm over 20

years at 85°C or 100 years at 25°C.

6. Capacitive touch sensing

The QTouch® Library provides a simple to use solution to realize touch sensitive interfaces on most AVR® micro-

controllers. The QTouch Library includes support for the QTouch and QMatrix acquisition methods.

Touch sensing can be added to any application by linking the appropriate QTouch Library for the AVR Microcon-

troller. This is done by using a simple set of APIs to define the touch channels and sensors, and then calling the

touch sensing API’s to retrieve the channel information and determine the touch sensor states.

The QTouch Library is FREE and downloadable from the Microchip website at the following location:

www.atmel.com/qtouchlibrary. For implementation details and other information, refer to the QTouch Library User

Guide - also available for download from the Microchip website.

ATMEGA640 데이터시트(PDF) 10 Page - Microchip Technology