As discussed earlier, 8085 microprocessor was introduced by Intel in the year 1976. This microprocessor is an update of 8080 microprocessor. The 8080 processor was updated with Enable/Disable instruction pins and Interrupt pins to form the 8085 microprocessor. Let us discuss the architecture of 8085 microprocessor in detail.
Features of 8085 microprocessor
Before knowing about the 8085 architecture in detail, lets us briefly discuss about the basic features of 8085 processor.
8085 microprocessor is an 8-bit microprocessor with a 40 pin dual in line package. The address and data bus are multiplexed in this processor which helps in providing more control signals. 8085 microprocessor has 1 Non-maskable interrupt and 3 maskable interrupts. It provides serial interfacing with serial input data (SID) and serial output data (SOD).
It has a set of registers for performing various operations. The various registers include
· Accumulator (register A)
· Registers: B, C, D, E, H and L
· Program Counter
· Temporary register
· Instruction register
Architecture of 8085 microprocessor
8085 consists of various units and each unit performs its own functions. The various units of a microprocessor are listed below
· Arithmetic and logic Unit
· General purpose register
· Instruction register and Decoder
· Timing and Control unit
· Interrupt control
· Serial Input/output control
· Address buffer and Address-Data buffer
· Address bus and Data bus
Accumulator is nothing but a register which can hold 8-bit data. Accumulator aids in storing two quantities.
The data to be processed by arithmetic and logic unit is stored in accumulator.
It also stores the result of the operation carried out by the Arithmetic and Logic unit.
The accumulator is also called an 8-bit register. The accumulator is connected to Internal Data bus and ALU (arithmetic and logic unit). The accumulator can be used to send or receive data from the Internal Data bus.
Arithmetic and Logic Unit
There is always a need to perform arithmetic operations like +, -, *, / and to perform logical operations like AND, OR, NOT etc. So there is a necessity for creating a separate unit which can perform such types of operations. These operations are performed by the Arithmetic and Logic Unit…
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