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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.
8-bit AVR 8-bit AVR Performance: 20 MIPS at 20 MHz [3] 20 MIPS at 20 MHz [3] Flash memory: 8 KB 16 KB SRAM: 1 KB 1 KB EEPROM: 512 B 512 B Pin count: 28 or 32 pin: 28 or 32 pin: Maximum operating frequency: 20 MHz 20 MHz Hardware QTouch Acquisition: No 20 MHz Maximum I/O pins: 23 23 External interrupts: 2 2 USB Interface: No No USB Speed – –
Among the first of the AVR line was the AT90S8515, which in a 40-pin DIP package has the same pinout as an 8051 microcontroller, including the external multiplexed address and data bus. The polarity of the RESET line was opposite (8051's having an active-high RESET, while the AVR has an active-low RESET ), but other than that the pinout was ...
Up to 4 pins may be required for implementing a JTAG standard interface. In general, modern protocols try to keep the number of pins used low, typically to 2 pins. Some ISP interfaces manage to achieve the same with just a single pin. Newer ATtiny microcontrollers with UPDI can even reuse that programming pin also as a general-purpose input ...
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).
1 4-digit counter/display driver 16 MM74C925: 74x926 1 4-digit decade counter/display driver, carry out and latch (up to 9999) 16 MM74C926: 74x927 1 4-digit timer counter/display driver (up to 9599, intended as time elapsed, i.e. 9:59.9 min) 16 MM74C927: 74x928 1 4-digit counter/display driver (up to 1999) 16 MM74C928: 74x929 1
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.
Project ButtLoad offers free plans to convert the Butterfly into a portable AVR-ISP for programming other AVR devices. [4] Several plans are available on the web to convert a Butterfly into an MP3 player. [5] C Programming for Microcontrollers, a book for learning to program AVRs using C, was written for the Butterfly as development platform ...