chapter 1 introduction to microprocessor and microcontroller

viii.Following this, the Control Unit (Controller Sequencer) produces control signals toget the data which is in the following location of memory (01H) and place it intoAccumulator, as what has requested by the instruction.The Execute Phase In this phase, CPU will carry out the requirement on the instruction. In this case, theCPU will move/copy data into Accumulator.i. The contain of PC (01H) is sent to AR (AR = 01H).ii.The contain of PC, as usual is incremented by 1 and become 02H now.iii.The contain of AR is placed on the Address Bus. Then, the location of the memoryis identified, which is 02H.iv.The data in the location of 02H is placed on Data Bus and is sent to the DR in theMP.v. From DR, the data straight away sends to Accumulator as what has requestedbefore (MOV A).vi.So, now the data ”10H” is inside the Accumulator. The instruction ”MOV A, #10H”has been executed.vii.These program-executional steps will be the same for any other instruction.1.8 TERMS OF PROCESSING DATA IN MICROPROCESSORInstruction Cycle It is the process by which a computer retrieves a program instruction from its memory,determine what actions the instruction required, and carry out the actions. This cycle is repeated continuously by the CPU, from booting up to shutting down of acomputer.Prepared by Tan KL Page 1-20