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AVR is a family of 8-bit RISC microcontrollers developed by Atmel, now Microchip Technology. They are widely used in embedded systems, especially in Arduino boards, and have various features such as flash memory, peripherals, and instruction sets.
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.
The 6809's internal design is closer to simpler, non-microcoded CPU designs. Like most 8-bit microprocessors, the 6809 implementation is a register-transfer level machine, using a central PLA to implement much of the instruction decoding as well as parts of the sequencing. Like the 6800 and 6502, the 6809 uses a two-phase clock to gate the latches.
The Zilog Z80 is an 8-bit microprocessor designed by Zilog that played an important role in the evolution of early computing. Software-compatible with the Intel 8080, it offered a compelling alternative due to its better integration and increased performance.
The 6800 architecture was a TTL-compatible LSI design modeled after the DEC PDP-11 processor. [33] The 6800 had an 8-bit bidirectional data bus, a 16-bit address bus that could address 64 KB of memory, and came in a 40-pin DIP package. The 6800 had two 8-bit accumulators, a 16-bit index register, and a 16-bit stack pointer.
The Intel 8080 ("eighty-eighty") is the second 8-bit microprocessor designed and manufactured by Intel.It first appeared in April 1974 and is an extended and enhanced variant of the earlier 8008 design, although without binary compatibility. [3]
Learn about the origins, characteristics and applications of 8-bit computing, the first widely used microprocessors in the computing industry. Find out the range, representation and examples of 8-bit data, memory and address buses, and the notable 8-bit CPUs such as Intel 8080, Zilog Z80 and Motorola 6800.
One 8-bit accumulator A, a 16-bit index register H:X, a 16-bit stack pointer SP, a 16-bit program counter PC, and an 8-bit condition code register CCR. Some instructions refer to the different bytes in the H:X index register independently. Among the HC08's there are dozens of processor families, each targeted to different embedded applications.