Addressing Mode: Logical Group

Logical Group:  A microprocessor is basically a programmable logic chip which can perform all the logic function of the hardwired logic through it instruction set. The 8085 instruction sets the 8085 instruction set includes such logic functions as AND, OR and NOT. The following features hold true for all logic instruction.

Data transfer group

Data transfer group: These instruction which are used to transfer a data from one register to another or register to memory or vice versa. E.g. MOV, MVI, LDA etc.

Arithmetic and Logic unit (ALU)

The ALU performs the computing function. It includes the accumulator, the temporary register, arithmetic and logic circuits and the flag register. The result in stored in the accumulator and the flags are ser or cleaned according to the result of operation.

Timing and Control Unit

This unit synchronizes all the microprocessor operation with the clock. The clock is symmetrical square wave signal that drives the CPU. The control circuitry and all the operations are drives by the clock signals.

Interrupt

The 8085 has 5 interrupt signals that can be used to interrupt a program execution. The various interrupt signals are INIR,RST 5.5, RST 6.5, RST 7.5 and TRAP.

Serial Input / Output Port

The 8085 has two signals to implement the serial transition transmission SID ans SOD. This two signals are used to transmitting the data serially.

Data and Address Bus

The 8085 has 8-bit data bus and hence 8-bit data can be transmitted parallel from and to a microprocessor. The 8085 has 16-bit address bus a memory address are of 16-bit.