Tutorial for learning the assembler language of
AVR-Single-Chip-Processor AT90Sxxxx
of ATMEL by programming practical examples.
Basic requirements
Targets
The following lectures introduce to the assembly language of
AVR-Single-chip-Processors of the AT90Sxxxx series by
ATMEL.
After going through these examples you should be able to write
simple programs for these processors. The examples might be
compiled with the ATMEL or any other assembler, the resulting
binary code should be transferred to the board and started
there. Every program step is commented.
Requirements
All examples are compatible with the ATMEL-assembler. If you
use other assemblers you probably have to change the code to
meet their special syntax requirements.
The examples run directy on the STK-200-programming board,
as supplied by ATMEL.
For all hardware-components on this board examples for their
programming and use are supplied in additional examples.
ATTENTION! All examples require the definition file "8515def.inc"
in the same directory with the source code, otherwise numerous
error messages occur during assebling. The file could be found
in the home directory of the ATMEL software package or on
ATMEL's homepage. Change
the path in the INCLUDE line from folder X:\avrtools\appnotes\
to your path or copy this file into your source code folder.
Steps
If you're a bloody beginner in assebler and AVR processors:
Load the examples test1 to test4 into your editor one by one,
read the comments in these files and try to figure out, if you
understand the single steps of the program, assemble the
source code and run the binary on the STK-200 board.
For the more advanced searching for certain component code:
Identify the proper example for the component and play around
with this code. Change it until it fits your needs.
