• 131 Instructions most of which are executed in a single clock cycle
• Up to 20 MIPS throughput at 20 MHz 
• In system programming by on-chip boot program 
• True read while write operation 
• Programming lock for software security

ATmega328 U IC which also known as ATmega328 U. So you may receive IC with printed name ATmega328P-U. The ATMEGA328 U is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega328 U achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The ATmega328 U AVR is supported with a full suite of program and system development tools including C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and Evaluation Kits.