The entire group of instructions that a microprocessor supports is called instruction set. Data remain in the registers till they are sent to the memory or io devices. The ivt entry must redirect the microprocessor to the actual service routine. The 8085 uses a total of 246 bit patterns to form its instruction set. Tutorial on introduction to 8085 architecture and programming. In a large computer the number of registers is more and hence the program requires less transfer of data to and from the memory. Intel 8085 microprocessor has the following registers.
These registers are not available for the programmer since 8085microprocessor architecture uses them internally. Register a is quite often called as an accumulator. The flag register is a special purpose register and it is completely different from other registers in microprocessor. The 80858080aprogramming model includes six registers, one accumulator, and one flag register. Mjcroprocessor me idiscovered your microprocessor opcode sheet by chance stumbleupon.
In small computers the number of registers is small due to the limited size of the chip. To perform the multiplication of two 8 bit numbers using 8085. It is a 40 pin c package fabricated on a single lsi chip. The time for the back cycle of the intel 8085 a2 is 200 ns. The 8085 8080aprogramming model includes six registers, one accumulator, and one flag register, as shown in figure. Each instruction is represented by an 8bit binary value. Lecture note on microprocessor and microcontroller theory vssut. Join researchgate to discover and stay uptodate with the latest research from leading experts in microprocessor 8085 and many other scientific topics.
The 80858080a programming model includes six registers, one accumulator, and one flag register. 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. Microprocessor consists of an alu, register array, and a control unit. Intel 8085 8bit microprocessor shrimati indira gandhi. A motivwting discussion is definitely worth comment. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor.