Opcode fetch - PowerPoint PPT Presentation

Microprocessor History

Microprocessor History. Early microprocessors. PMOS technology – slow and awkward to interface with TTL family 4 bit processor Instructions were executed in about 20 µs. Intel 4004 the first MP. 4K nibbles address space. Intel 8008- can manipulate a whole byte. 16Kbytes address space

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Types of Instruction

Types of Instruction. ADD R ADD M (ADD REGISTER TO ACCUMULATOR). ADD B. AFTER EXECUTION. BEFORE EXECUTION. 98. ADD M. 65. BA. 55. 20. 50. ADC R ADC M (ADD REGISTER TO ACCUMULATOR WITH CARRY). ADD B. 1. BEFORE EXECUTION. AFTER EXECUTION. 98. 99. ADC M. 65. BEFORE EXECUTION.

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Timing Diagram of 8085

Timing Diagram of 8085. Collected by C.Gokul, AP/EEE, VCET-Erode. References: 1.8085 microprocessor by Sajid Akram , researcher/lecturer at c.abdul hakeem college of engineering and technology 2.Timingdiagram by puja00 (slideshare.net) 3.Microprocessor 8086 by Gopikrishna

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