Features
   
      
         - 8-bit, high-performance AVR RISC CPU
               - 135 instructions
 
               - Hardware multiplier
 
            
 
         - 32 8-bit registers directly connected
            to the ALU
 
         - Stack in RAM
 
         - Stack pointer accessible in I/O memory space
 
         - Direct addressing of up to 64KB of
            unified memory
               - Entire Flash accessible with all
                  LD/ST instructions
 
            
 
         - True 16-bit access to 16-bit I/O registers
 
         - Efficient support for 8-, 16-, and 32-bit arithmetic
 
         - Configuration Change Protection for
            system-critical features