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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.
A half-carry flag (also known as an auxiliary flag) is a condition flag bit in the status register of many CPU families, such as the Intel 8080, Zilog Z80, the x86, [1] and the Atmel AVR series, among others.
The AVR architecture was conceived by two students at the Norwegian Institute of Technology (NTH), [1] Alf-Egil Bogen [2] and Vegard Wollan. [3] Atmel says that the name AVR is not an acronym and does not stand for anything in particular. The creators of the AVR give no definitive answer as to what the term "AVR" stands for. [3]
Atmel Mega88V with 8 KB Flash memory Variant ATmega168 with 16 KB Flash memory. The ATmega88 is an electronic integrated circuit microcontroller produced by the Atmel corporation. 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 ...
Unlike 2-operand or 1-operand, this leaves all three values a, b, and c in registers available for further reuse. [11] more operands—some CISC machines permit a variety of addressing modes that allow more than 3 operands (registers or memory accesses), such as the VAX "POLY" polynomial evaluation instruction.
Examples include the PIC by Microchip Technology, Inc. and the AVR by Atmel Corp (now part of Microchip Technology). Even in these cases, it is common to employ special instructions in order to access program memory as though it were data for read-only tables, or for reprogramming; those processors are modified Harvard architecture processors.
The Atmel AVR and the PIC microcontroller each have a two-stage pipeline. Many designs include pipelines as long as 7, 10 and even 20 stages (as in the Intel Pentium 4). The later "Prescott" and "Cedar Mill" NetBurst cores from Intel, used in the last Pentium 4 models and their Pentium D and Xeon derivatives, have a long 31-stage pipeline.
ATmega328 is commonly used in many projects and autonomous systems where a simple, low-powered, low-cost micro-controller is needed. Perhaps the most common implementation of this chip is on the popular Arduino development platform, namely the Arduino Uno, Arduino Pro Mini [4] and Arduino Nano models.