![]() Assemblers, Compilers, Linkers and LibrariansĪssemblers or (C-) Compilerstranslate the human readable source code into "hex code" that represents the machine instructions (op codes). For that reason a microcontroller's firmware in machine readable form is also called Hex-Code and the file that stores that code Hex-File. ![]() Instead of writing opcodes in bits, they are commonly represented as hexadecimal numbers, whereby one hex number represents 4 bits within a byte, so it takes two hex numbers to represent 8 bits or 1 byte. Op codes are a unique sequence of bits ("0" and "1") that are decoded by the controller's instruction decode logic and then executed. A microcontrollers instruction set is represented by "op codes". ![]() Next the source code needs to be translated into instructions the microcontroller can actually execute. The penalty for more portable code and faster program development is a larger code size (20%.40% compared to assembler). A higher level language like C is for the most part independent of a microcontroller's specific architecture, but still requires some controller specific extensions of the standard language to be able to control all of a chip's peripherals and functionality. Programming in assembler involves learning a microcontroller's specific instruction set (assembler mnemonics), but results in the most compact and fastest code. This source code is written with a standard ASCII text editor and saved as an ASCII text file. Software Code for a microcontroller is written in a programming language of choice (often Assembler or C).
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |