SDCC, Small Device C Compiler, is a free C compiler for small device, i.e. microcontroller. Writed firstly by Sandeep Dutta. SDCC is a retargettable, optimizing ANSI - C compiler that targets the Intel 8051, Maxim 80DS390, Zilog Z80 and the Motorola 68HC08 based MCUs. Work is in progress on supporting the Microchip PIC16 and PIC18 series. SDCC is Free Open Source Software, distributed under GNU General Public License (GPL).
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Microcontroller (or MCU, microcontroller unit), is a computer-on-a-chip [1]. A system could be called a computer if it has at least processor, memory, and input/output (I/O) device; lack one of the three, it never be a computer. Lack of processor, it can not do any logical or arithmetic in order to process the information. Lack of memory, so where the program would take a place. Lack of I/O device, it can’t interact with "outside world", and will be useless, can’t take any advantages from it.
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