Code Example: To store the sum of memory variables A and B

into location C of memory:

Load R1,A ;copy A from memory into register R1

Load R2,B ;copy B from memory into register R2.

Add R3,R1,R2 ;put R1 + R2 into register R3.

Store C,R3 ;store R3 into memory location C.

Benefits: Arithmetic doesn't overwrite source operands. Simple

fixed-length encoding. Simple code generation model. Similar

number of clock pulses per instruction.

Disadvantages: Higher instruction count: extra load/store

instructions required. Wasted space in arithmetic

instructions.