Basics of 8085 microprocessor architecture

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1. Unit-I Microprocessors and Microcontrollers 8085 Microprocessor: Basics of 8085 microprocessor architecture and its functional block, 8085 microprocessor IC pin outs and signals, addressing modes of 8085.

2. Block diagram of 8085

3. Pin diagram

4. Addressing modes in 8085 The addressing modes in 8085 microprocessors are instructions used to transfer data and perform operations on them. An 8085 microprocessor uses five addressing modes:  Immediate addressing mode, Register addressing mode, Register indirect addressing mode , Direct addressing mode , Implicit addressing mode.

5. The architecture of the 8085 microprocessor consists of several key components, including the accumulator, registers, program counter, stack pointer, instruction register, flags register, data bus, address bus, and control bus. The accumulator is an 8-bit register that is used to store arithmetic and logical results.

6. In its simplest form a multi-chip fixed architecture microprocessor consists of three circuits: ( i ) The central processor which may have 8-, 12- or 16-bit capability ( ii) The microprogram sequence control logic ( iii) The microprogram ROM.