Beginners Introduction to the Assembly Language of ATMEL AVR Microprocessors


Beginners Introduction to the Assembly Language of ATMEL AVR Microprocessors






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TOC



Why learning Assembler



Short and easy

Fast and quick

Assembler is easy to learn

AT90Sxxxx are ideal for learning assembler

Test it



Hardware for AVRAssemblerProgramming



The ISP Interface of the AVR processor family

Programmer for the PC Parallel Port

Experimental board with a AT90S2313

Readytouse

commercial programming boards for the AVR family



Tools for AVR assembly programing



The editor

The assembler

Programming the chips

Simulation in the studio



Register



What is a register?

Different registers

Pointerregister

Recommendation for the use of registers



Ports



What is a Port?

Details of relevant ports in the AVR

The status register as the most used port

Port details

SRAM

Using SRAM in AVR assembler language

What is SRAM?

For what purposes can I use SRAM?

How to use SR15

Use of SRAM as stack

Defining SRAM as stack

Use of the stac

Bugs with the stack operation



Jumping and Branching



Controlling sequential execution of the program

What happens during a reset?

Linear program execution and branches

Timing during program execution

Macros and program execution

Subroutines

Interrupts and program execution



Calculations



Number systems in assembler

Positive whole numbers (bytes, words, etc.)

Signed numbers (integers)

Binary Coded Digits, BCD

Packed BCDs

Numbers in ASCII format

Bit manipulations

Shift and rotate

Adding, subtracting and comparing

Format conversion for numbers

Multiplication

Decimal multiplication

Binary multiplication

AVRAssembler

program

Binary rotation

Multiplication in the studio

Division

Decimal division

Binary division

Program steps during division

Division in the simulator

Number conversion

Decimal Fractions

Linear conve

Example 1: 8 bit AD converter

with fixed decimal output

Example 2: 10 bit AD converter

with fixed decimal output



Annex



Commands sorted by function

Command list in alphabetic order

Assembler directives

Commands

Port details

Status Register,

Accumulator flags

Stackpointer

SRAM and External Interrupt control

External Interrupt Control

Timer Interrupt Control

Timer/Counter 0

Timer/Counter 1

Watchdog Timer

EEPROM

Serial Peripheral Interface SPI

UART

Analog Comparator

I/O Ports

Ports, alphabetic order

List of abbreviation

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