1 - Microprocessor (Computers central Processing Unit) Ex:...

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Unformatted text preview: Microprocessor (Computers central Processing Unit) Ex: Pentium, 68000 etc. has two parts Control part says what to do Data part does it Steps in Execution of an Instruction CPU fetches instruction from Main Memory CPU Decodes the Instruction Op-code Depending on Op-code- Fetches another operand- Execute instruction via register to register transfer- Write the results in M- Write the results in I/O Repeats the steps REG SET ALU CLU CENTRAL PROCESSING UNIT Register Set: Program Counter PC PC + 1, PC Address part of the branch Instruction Instruction Register IR M [PC] General Purpose Registers Instruction and Address Formats: Opcode + Operands First Generation Computers Opcode A0 A1 A2 A3- Because of sequential nature A3 not required Two address Format OPCODE A0 A1 ADD AX, BX (8086) One Address Format OPCODE A0 ADD B (8085) Zero address Machines : (Stack Machines) ADD Ex: X = A*B + C*D 3-adr m/c...
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This note was uploaded on 03/14/2010 for the course CSE SSZG516 taught by Professor Muralip during the Summer '10 term at Birla Institute of Technology & Science.

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1 - Microprocessor (Computers central Processing Unit) Ex:...

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