Datasheet
ATmega48A/PA/88A/PA/168A/PA/328/P
2018 Microchip Technology Inc. Data Sheet Complete DS40002061A-page 17
ATmega48A/PA/88A/PA/168A/PA/328/P support a real Read-While-Write Self-Programming mechanism.
There is a separate Boot Loader Section, and the SPM instruction can only execute from there. In ATmega
48A/48PA there is no Read-While-Write support and no separate Boot Loader Section. The SPM instruction can
execute from the entire Flash
3. Resources
A comprehensive set of development tools, application notes and data sheets are available for download on
www.microchip.com
Note: 1.
4. 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.
5. About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of the device.
These code examples assume that the part specific header file is included before compilation. Be aware that not
all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler
dependent. Confirm with the C compiler documentation for more details.
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”.
6. Capacitive Touch Sensing
The QTouch Library provides a simple to use solution to realize touch sensitive interfaces on most AVR
microcontrollers. 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
Microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors, and then
calling the touch sensing APIs 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
http://www.microchip.com. For implementation details and other information, refer to the QTouch Library User
Guide - also available for download from the Microchip website.