8085 microbrocessor is the base processor to understand the operation of a processor. the basic funda is processor do teh processing of the data, the rest of work is handle by peripherials of requied specific function. The basic building block of microprocessor based sysytem has been divided into ALU unit, memory (read only memory and read/ write memory), input output device, control unit. The 8085 is an 40 pin integrated circuit, with 2 pin for crystal frequency, 5 pin for interruput, 1 pin for interruput acknowledgement, 8 pin multiplex with lower address bus and data bus, 8 pin for higer address bus, 1 pin ground, 1 pin for power supply and other for the different control signals. The programming model of the microprocessor consist of eight 8 bit registers, two 16 bit registers, 8 bit bidirectional data bus, 16 bit unidirectional data bus. The instruction set of microprocessor had been divided in to 5 categories: Data movement, Arthmatical, logical, branching, machine control.
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