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The Atmel AVR instruction set is the machine language for the Atmel AVR, a modified Harvard architecture 8-bit RISC single chip microcontroller which was developed by Atmel in 1996. The AVR was one of the first microcontroller families to use on-chip flash memory for program storage.
ATtiny (also known as TinyAVR) is a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).
AVR32 is a 32-bit RISC microcontroller architecture produced by Atmel.The microcontroller architecture was designed by a handful of people educated at the Norwegian University of Science and Technology, including lead designer Øyvind Strøm and CPU architect Erik Renno in Atmel's Norwegian design center.
SDAS (fork of ASxxxx Cross Assemblers and part of the Small Device C Compiler project): GPL: several target instruction sets including Intel 8051, Zilog Z80, Freescale 68HC08, PIC microcontroller. The Amsterdam Compiler Kit (ACK) targets many architectures of the 1980s, including 6502 , 6800 , 680x0 , ARM , x86 , Zilog Z80 and Z8000 .
The instruction set was similar to other RISC cores, but it was not compatible with the original AVR (nor any of the various ARM cores). Since then support for AVR32 has been dropped from Linux as of kernel 4.12; compiler support for the architecture in GCC was never mainlined into the compiler's central source-code repository and was available ...
The ARM processors are RISC (reduced instruction set computing). This is similar to Microchip's AVR 8-bit products, a later adoption of RISC architecture. Whereas the AVR architecture used Harvard architecture exclusively, some ARM cores are Harvard (Cortex-M3) and others are Von Neumann architecture (ARM7TDMI).
An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
It has the basic Atmel AVR instruction set. One of the packaging configurations is the dual in-line package . It has 23 I/O pins and operates at up to 20 MHz for clock speed. It has an 8-bit core and 8K flash (program) memory. [1]