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AVR 32 -bit exist .There bit by bit operation .
Yes, There are many kinds of AVR microcontrollers with different properties. Except for AVR32, which is a 32bit microcontroller, AVRs are all 8bit microprocessor, meaning that the CPU can work only 8 bits of data at time. Data larger than 8 bits has to be broken into 8 bit pieces to be processes by the CPU.
