What is the technology used in the manufacture of 8085. Over view of microprocessor 8085 and its application. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. Registers used in 8085 microprocessor and their details. However the operand and the address information may not be of the same size. The sole purpose of register is to hold data for some time. In a large computer the number of registers is more and hence the program requires less transfer of data to and from the memory. General purpose registers store temporary data during program execution, which can also be stored in different accessible memory locations. Microcontroller microprocessor with built in memory and ports and can be programmed for any generic control application. Instead operands as well as addresses are stored at the time of program execution.
The 8085 machine language the 8085 from intel is an 8bit microprocessor. It has 8bit accumulator, flag register, instruction, register, six 8bit general purpose. What are general purpose registers in 8086 answers. The 8085 has six generalpurpose registers to store 8bit data. The 8085 uses a total of 246 bit patterns to form its instruction set. It is 40 pin ic, requires 3 mhz speed of operation and clock cycle is 320 ns. The microprocessor is a semi programmable logic device that can be used to control processes. In 8085 general purpose registers are used to hold data like any other registers. Interview questions on microprocessor with detailed answers. General purpose registers in 8086 microprocessor geeksforgeeks.
The 80858080aprogramming model includes six registers, one accumulator, and one flag register. Immediate addressing,register addressing,direct addressing,indirect addressing. Over view of microprocessor 8085 and its application iosr journal. There are 8 general purpose registers in 8086 microprocessor. In 8085 there are six types of special registers called general purpose registers. Central processing unit cpu is carved on a single chip is called a microprocessor. The 8085 have six general purpose registers to store 8bit data during program execution. Special purpose register a program counter 16 bit register, used to point address of memory b instruction register 8 bit register to store instruction. The registers ax, bx, cx and dx are the general purpose 16bit registers. They may be either used for holding data, variables and. It is an 8bit microprocessor which was introduced by intel in the year 1976 using nmos technology. The accumulator is an 8bit register that is a part of arithmeticlogic unit alu.
The internal architecture of 8085 includes the alu, timing and control unit, instruction register and decoder, register array, interrupt control and serial io control. The reason for the difference is that some actually most instructions have multiple different formats. The register file is the component that contains all the general purpose registers of the microprocessor. General purpose registers gpr are not used for storing any specific type of information. Its alu arithmetic logic unit is of 8 bit, its general purpose registers which holds data for processing, are 8bit. There are 6 general purpose registers in 8085 microprocessor. Registers used in 8085 microprocessor student study hub.
The ahal pair is observed because the ax register, the bhbl pair is observed because the. If the stack is empty the stack pointer will be fffeh. When designing a cpu, some people distinguish between architectural features and the implementation details. An 8bit microprocessor can process 8bit data at a time. It is a 40 pin c package fabricated on a single lsi chip. Over view of microprocessor 8085 and its application doi. In small computers the number of registers is small due to the limited size of the chip. It has 16bit address bus and hence can address up to 216 65536 bytes 64kb. Eight of the registers are known as general purpose registers i. Registers used1 simple register main register 2general purpose register 3special function register 4other register 1simple registers a accumulator a 8 bit b used as a register for storing one data when two are arithmetically and logically operated. There are 6 general purpose registers in 8085 processor, i. General purpose registers ax accumulator register preferred register to use in arithmetic, logic and data transfer instructions because it generates the shortest machine language code must be used in multiplication and division operations must also be used in io operations bx base register.
The 8086 registers are classified into the following types. Register organization has a powerful set of registers known as general purpose and special purpose registers. Registers b, c, d, e, h and c and five 16bit registers sp. The functional components of a cpu are arithmetic logic unit alu, control and timing units, registers are found in a single integrated circuit called ic. The general purpose registers, can be used as either 8bit registers or 16bit registers.
Certain pairs of those general purpose registers will be used together to store 16bit data words. Data remain in the registers till they are sent to the memory or io devices. Registers b, c, d, e, h, and l are general purpose registers in 8085. Ans there are 6 general purpose registers in 8085 microprocessor.
It is one of the general purpose register of microprocessor also called as a register. Introduction fundamentals of microprocessor 8085 and. Feb 20, 2017 56 videos play all microprocessors 8085, 8086 by bharat acharya bharat acharya education concept of binary, hexadecimal and decimal bharat acharya education duration. Apart from the above function these registers can also. First, a register is a flip flop circuit in electronics language which temporarily holds data. Lecture note on microprocessor and microcontroller theory and.
Microprocessor designregister file wikibooks, open books. Tutorial on introduction to 8085 architecture and programming. Instructions of various types 1byte,2byte and 3byte are explained. Today the computing power of a powerful microprocessor approaches that a cpu on earlier large computer.
What is meant by the statement that 8085 is a 8bit microprocessor. Microprocessor 8085 architecture in microprocessor tutorial. This page of 8085 microprocessor tutorial describes 8085 microprocessor programming. It depends upon the width of internal data bus, registers, alu, etc. General purpose registers in 8086 microprocessor microprocessor. The general purpose registers in 8085 processors are b, c, d, e, h and l. Oct 29, 20 registers used in 8085 microprocessor and their details. Al register is also called accumulator because it has some characteristics different from other general purpose registers.
Registers the 8085 8080aprogramming model includes six registers, one accumulator, and one flag register, as shown in figure. Registers of 8085 microprocessor a microprocessor is a multipurpose, programmable, clockdriven, registerbased electronic device that reads binary instructions from a storage device called memory, accepts binary data as input and processes data according to those instructions and provide results as output. It can be used to store additional data during a program. Microprocessors 6 microprocessor is a controlling unit of a microcomputer, fabricated on a small chip capable. The 8085 8080a has six general purpose registers to store 8bit data. What is the general purpose register in 8085 microprocessor.
The introduction of the superior 8bit 8085 microprocessor. Similarly, a 16 bit processor handles 16 bit data at a time and its alu, general purpose registers, are of 16 bits. And this alu it does operations in 8 bit, 8 in in terms of 8 bits. The 8086 microprocessor has a 16 bit register for flag register.
The time for the back cycle of the intel 8085 a2 is 200 ns. What is 8085 microprocessor architecture and its functional units accumulator, arithmetic and logic unit, general purpose register, program counter, stack pointer. General purpose microprocessor used in general computer system and can be used by programmer for any application. They are designated by the letters b, c, d, e, h, and l. This register has 9 flags which are divided into two parts that are as follows. The microprocessor performs the following four operations using address bus, data bus and control bus. It consists of three main sections, an arithmetic and logic unit a timing and control unit and several registers. Registers used1 simple register main register 2 general purpose register 3special function register 4other register 1simple registers a accumulator a 8 bit b used as a register for storing one data when two are arithmetically and logically operated. The word length ranges from 4 bits to 64 bits depending upon the type of the microcomputer. For example, cx is used as a counter in conjunction with loop. General purpose registers are used to store temporary data within the microprocessor. General purpose registers the four general purpose registers are the ax, bx, cx, and dx registers. In this subject well study about two microprocessors namely intel 8085.
This register is used to store 8bit data and to perform arithmetic and logical operations. A few cpus also place special registers such as the pc and the status register in the register file. A microprocessor which has n data lines is called an nbit microprocessor i. Microprocessor lecture 3 different types of registers in. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.