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#8085

#Kilinjal #8085, #Architecture of 8085 Tamil, Architecture of 8085 microprocessor ARCHITECTURE DESCRIPTION: ALU: Arithmetic & Logic Unit: This unit can perform all arithmetic operations like addition, subtraction and all logical operations like AND, OR on 8-bit data. A-REGISTER (or) ACCUMULATOR: This is an 8-bit register. This holds the first operand of ALU. The result coming from ALU is stored in Accumulator. The data present in A-register is changed after every execution of ALU. Hence the name Accumulator. TEMPORARY REGISTER: This is an 8-bit register used to store data. This register cannot be used by the programmer. In 8085 we have three temporary registers. FLAG REGISTER: This is an 8-bit register but we use only 5-bits. (Sign, Zero, Auxiliary Carry, Parity, Carry) This register is used to store the STATUS of ALU's result. REGISTER ARRAY: In this array we have six 8-bit registers.(B, C, D, E, H, L) These registers are used to store data. These registers can be used either as a separate register to store 8-bit data or as a register pair to store 16-bit data. B register pair---B & C work together D register pair---D & E work together H register pair---H & L work together PROGRAM COUNTER: This is a 16-bit register This register stores the address of next instruction to be executed. STACK POINTER: This is a 16-bit register. Stores the address of top of the stack memory. While storing the data into the stack, the stack pointer gets decremented. While receiving the data from the stack, the stack pointer gets incremented. INCREMENTER / DECREMENTER: This block is used to increment or decrement the value present in 16-bit register. INSTRUCTION REGISTER: This is an 8-bit register used to receive instructions from memory. INSTRUCTION DECODER: In this unit the processor understands the meaning of received byte from instruction register. TIMING & CONTROL UNIT: This unit is used to provide the necessary control signals for various operation. INTERRUPT CONTROL: Interrupt is an external signal which disturbs the normal execution of microprocessor. This block will receive and respond to those interrupts and indicate the microprocessor to work accordingly. In 8085 we have five interrupt signals (TRAP, RST5.5, RST6.5, RST7.5, INTR) and one acknowledgement(INTA). SERIAL I/O CONTROL: This unit is used to receive data from external source serially (i.e) bit by bit. SID- Serial Input Data which is used to receive data bit by bit. SOD- Serial Output Data which is used to send out the data. Thanks for watching our video. Please do watch our playlist to find related videos on the topic. E-Mail - kilinjal09@gmail.com Facebook Page - Kilinjal