What is the difference between the AVR series MCU and other standard MCU from Atmel? What is so special about the AVR?
- posted
20 years ago
What is the difference between the AVR series MCU and other standard MCU from Atmel? What is so special about the AVR?
look at atmel.com
Hi!
Nothing special. But AVR is their own 8 bit RISC architecture.Just take a look at the description of the at90S8515.
But they also sell CPU's based on the 8051 (8 bit CISC - AT89) or ARM (32bit RISC AT91). And there is a product line with 4 bit.
-- Dirk
Others have answered the "difference" question. WRT the "special" question:
- The instruction clock is 1:1 with the oscillator. Some other micros require four oscillator cycles for each instruction clock cycle. Some even require twelve.
- To go along with that, many frequently used instructions execute in a single instruction cycle, which results in a relatively fast chip.
- The processor register bank consists of 32 8-bit registers. There is some split in functionality (e.g., only registers 16 - 31 can use "immediate" instructions, like a literal load).
- It's a Harvard architecture with linear addressing up to 64 KB for both program and data address space. No banks or paging.
- In-system programmable with inexpensive (or even build-your-own) serial programmers.
-- Rich Webb Norfolk, VA
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