Registers in microprocessor 8085 pdf

Join researchgate to discover and stay uptodate with the latest research from leading experts in microprocessor 8085 and many other scientific topics. The basic units or blocks of a microprocessor are alu, an array of registers. The 80858080aprogramming model includes six registers, one accumulator, and one flag register. In a large computer the number of registers is more and hence the program requires less transfer of data to and from the memory. A motivwting discussion is definitely worth comment. Mjcroprocessor me idiscovered your microprocessor opcode sheet by chance stumbleupon. Register a is quite often called as an accumulator. These registers are not available for the programmer since 8085microprocessor architecture uses them internally. So, as we have seen that any processor, it will have an arithmetic logic unit it will have some register file consisting of a set of registers, and some controller. The flag register is a special purpose register and it is completely different from other registers in microprocessor. 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. The 8085 resets clears instruction register, interrupt mask bits and other registers. The entire group of instructions that a microprocessor supports is called instruction set. Intel 8085 8bit microprocessor shrimati indira gandhi.

Each instruction is represented by an 8bit binary value. The 8085 includes six registers, one accumulator and one flag register, as shown in fig. The 8085 uses a total of 246 bit patterns to form its instruction set. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. When the microprocessor executes the rst instruction received from the device, it saves the address of the next instruction on the stack and jumps to the appropriate entry in the ivt. The 8085 8080aprogramming model includes six registers, one accumulator, and one flag register, as shown in figure.

Data remain in the registers till they are sent to the memory or io devices. Microprocessor consists of an alu, register array, and a control unit. The time for the back cycle of the intel 8085 a2 is 200 ns. To perform the multiplication of two 8 bit numbers using 8085. Lecture note on microprocessor and microcontroller theory vssut. Tutorial on introduction to 8085 architecture and programming. In small computers the number of registers is small due to the limited size of the chip. It is a 40 pin c package fabricated on a single lsi chip. The ivt entry must redirect the microprocessor to the actual service routine.