Instruction register in 8085

 

 

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FLAG REGISTER The Status Flags of the 8080 and 8085 are single bits which indicate the logical conditions that existed as a result of the execution of the instruction just completed. This allows instructions following to act accordingly, such as a branch as a result of two values comparing equal. The instruction register is an internal register that holds the value of the instruction opcode in order for the 8085 to decode and process the instruction. While it. 8085 microprocessor questions 1. What are the various registers in 8085? - Accumulator register, Temporary register, Instruction register I know the two inputs of ALU are accumulator and the temporary register.I was bit curious that why we store intermediate result in a temporary register and why not the data bus is In effect, the temporary register holds the result of the memory operation for use by the ALU in the next processor cycle. 8085 Microprocessor Lab Viva Questions With Answers 1. What are the important CPU registers in the 8085 microprocessor? Explain. 'Store accumulator indirect' instruction set is used for copying the contents of the accumulator to the memory location specified by register pair. This is a multipurpose instruction and used to implement the 8085 interrupts 7.5, 6.5, 5.5, and serial data output. The instruction interprets the accumulator contents as follows. Statement: Write a set of instructions to alter the contents of flag register in 8085. Architecture & Instruction set of 8085 microprocessor 8085 is pronounced as "eighty-eighty-five" microprocessor. It is an 8-bit microprocessor designed by Intel General purpose register There are 6 general purpose registers in 8085 processor, i.e. B, C, D, E, H & L. Each register can hold 8-bit data. The 8085 processor has six general purpose registers that can store 8-bit data. The general purpose registers are named as B, C, D, E, H, and L What Is Instruction Register In 8085 Architecture ? The instruction register ( IR ) is a 8 bit special purpose register used by the processor to store the Further when an instruction ADD C is decoded by the 8085, then data at C register is added to the data present in register A and is stored at register A. Due to such cumulative action, register A is termed as an accumulator. Basically, the timing and control circuit timely sends the signals to the Accumulator register, Temporary register, Instruction register, Stack Pointer, Program Counter are the various registers in 8085. Stack pointer is a special purpose 16-bit register in the Microprocessor, which holds the address of the top of the stack. Question 4. What Is Program Counter? UNIT I - INTEL 8085 INSTRUCTION REGISTER & DECODER: When an instruction is fetched from memory it is placed in instruction register. Then it is decoded Microprocessors—Evolution and Introduction to 8085 1 2. Methods of Data Transfer and Serial Transfer Protocols 47 1.11.4 The instructions described here are of Intel 8085. Instructions, which are used to transfer data from one register to another register, from memory to register or register to memory, come under this group. Instruction Set of 8085. — An instruction is a binary pattern designed inside a microprocessor to perform a specific function. — The contents of the source register are not altered. — If one of the operands is a memory location, its location is specified by the contents of the HL registers. Instruction Set of 8085. — An instruction is a binary pattern designed inside a microprocessor to perform a specific function. — The contents of the source register are not altered. — If one of the operands is a memory location, its location is specified by the contents of the HL registers. 8080/8085 assembly language programming manual. Copyright © 1977,1978 Intel Corporation Intel Corporation, 3065 Bowers Avenue Assembler outputs comparison of assembly language with pl/M 8080{8085 internal registers instruction fetch 8085-Processor About Processor WORKING THEORY OPERATIONS SUPPORT INSTRUCTION FORMAT License. Memory reading or writing is done in fourth clock cycle and value is available at Multiplexer for writing in Register file.

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