The ADD operation proceeds similarly to the AND operation. The only difference is that once the operand is loaded from memory it is arithmetically added to the current contents of the …

Condition Codes LC-3 has three condition code registers: N -- negative Z -- zero P -- positive (greater than zero) Set by any instruction that writes a value to a register (ADD, AND, NOT, …

z Example an instruction to add the contents of two registers (Rx and Ry) and place result in a third register (Rz) z Step 1: Get the ADD instruction from memory into an instruction register z …

What is an Instruction Set? How many ops? What can they do? How complex are they? Which operations can be performed on which registers? General purpose and specific registers.

Indirect Addressing (1) Memory cell pointed to by address field contains the address of (pointer to) the operand EA = (A) —Look in A, find address (A) and look there for operand e.g. ADD (A) …

Operation code + Address Op code must have n bits for ≤ 2n operations Op code sometimes called a macrooperation Address is register or memory location Memory location is operand …

Register files have a memory-like behavior. However, they are very different from memories like SRAM, ROM, etc. as will be explained in more detail in class. They are generally used as fast. …

INSTRUCTION EXECUTION AND TIMING DIAGRAM: Each instruction in 8085 microprocessor consists of two part- operation code (opcode) and operand. The opcode is a command such …

User processes have to handle their own memory management. The range of bytes in memory that are assigned to a process. The address space can begin anywhere in memory. Say your …

• ADD, AND, NOT Source and destination operands are registers • Do not reference memory • ADD and AND can use “immediate” mode, (i.e., one operand is hard-wired into instruction) …