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The largest binary number written in assembly language is 1111111111111111. There are only two digits in use (0 and 1). For example 54h.īinary numbers are often used when the value of each individual bit of some of the registers is important, since each binary digit represents one bit. In order to distinguish hexadecimal numbers from decimal, they are followed by the letter “h”(either in upper- or lowercase). The largest hexadecimal number that can be written in assembly language is FFFF. There are 16 digits in hexadecimal number system (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F). Hexadecimal numbers are commonly used in programming. If it is necessary to specify that some of the numbers is in decimal format, then it has to be followed by the letter “D”. Since at most 2 bytes are used for saving them in the microcontroller, the largest decimal number that can be written in assembly language is 65535. If not stated otherwise, the assembly language considers all the numbers as decimal. If octal number system, otherwise considered as obsolite, is disregarded, assembly laguage allows numbers to be used in one out of three number systems: For the sake of better clearness, a push button TAB on a keyboard is commonly used instead of it, so that it is easy to delimit columns with labels, directives etc.
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Text following the mark “ ” in a program line represents a comment ignored (not compiled) by the assembler and.Every program line to be compiled, must start with a symbol, label, mnemonics or directive.Every program line may consist of a maximum of 255 characters.
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These compulsory rules are called syntax and there are only several of them: When writing a program in assembly language it is necessary to observe specific rules in order to enable the process of compiling into executable “HEX-code” to run without errors. The basic elements of assembly language are: Assembly language is basically like any other language, which means that it has its words, rules and syntax.