8085 microprocessor architecture mpi(mai)
- 1. Prepared by - Ravin Laheri (160120107054) Computer- B1 Gandhinagar Institute of Technology Subject – Microprocessor And Interfacing (2150707) Topic - 8085 Internal Architecture Guided by – Prof. Megha Desai
- 2. Microprocessor A microprocessor is a computer processor that incorporates the functions of a central processing unit on a single integrated circuit, or at most a few integrated circuits. It can be programmed to perform functions on given data by writing specific instruction into is memory It reads one instruction at a time, matches it with its instruction set and perform the data manipulation specified. The result is either stored back into memory or displayed on output device.
- 3. The 8085 system consists of : 1.CPU • ALU • Control Logic • Registers 2.Memory 3.Input / Output interfaces
- 5. The 8085 uses three separate busses to perform is operations : 1.Address Bus 2.Data Bus 3.Control Bus The 8-bit 8085 CPU (or MPU – Micro Processing Unit) communicates with the other units using a 16-bit address bus, an 8- bit data bus and a control bus. 8085: Bus Structure
- 6. Address Bus • Consists of 16 address lines: A0 – A15 • Operates in unidirectional mode: The address bits are always sent from the MPU to peripheral devices, not reverse. • 16 address lines are capable of addressing a • Total of 216 = 65,536 (64k) memory locations. • Address locations: 0000 (hex) – FFFF (hex)
- 7. Data Bus • Consists of 8 data lines: D0 – D7 • Operates in bidirectional mode: The data bits are sent from the MPU to peripheral devices, as well as from the peripheral devices to the MPU. • Data range: 00 (hex) – FF (hex)