1. 7. 5. Acumulator:-It is a 8-bit register which is used to perform airthmetical and logical operation. They can be combined as register pairs - BC, DE, and HL - to perform some 16-bit operations. 8085 pin description. 1. 8085 Microprocessor Architecture. Instruction set classification. _ keep it cool.pdf from EEE 202 at Arizona State University. Address Bus − 8085 has 16-bit address bus while 8086 has 20-bit address bus. Internal Architecture of 8085 Microprocessor 8085 Architecture: Control Unit Generates signals within uP to carry out the instruction, which has been decoded. 5. A microprocessor is a multipurpose, programmable, clock-driven, register-based 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. Size − 8085 is 8-bit microprocessor, whereas 8086 is 16-bit microprocessor. Pin diagram of 8085 microprocessor is as given below: 1. In 8085 microprocessor there have lots of special purpose register which have specific task. The microprocessor 8080 consists of 40 pins and it microprocessor transfers internal information and data through an 8- bit, bidirectional 3-state data bus (D0-D7). The programmer can use these registers to store or copy data into the registers by using data copy instructions. It is used in almost all types of electronics devices like mobile phones, printers, washing machines, etc. The address and data bus are multiplexed in this processor which helps in providing more control signals. In this article we will discuss about 8085 microprocessor architecture. Bus is a group of conducting wires which carries information, all the peripherals are connected to microprocessor through Bus. It provides serial interfacing with serial input data (SID) and serial output data (SOD). Memory − 8085 can access up to 64Kb, whereas 8086 can access up to 1 Mb of memory. The stack size of Intel's 8085 microprocessor is theoretically 64 kb, but the real limit is a function of memory and program architecture and layout. View Notes - Draw and explain the internal architecture of 8085. The term “16-bit” means that its arithmetic logic unit, internal registers, and most of its instructions are designed to work 16-bit binary words. Internal Architecture of 8085 Microprocessor: The architecture of 8085 consists of three main sections, ALU (Arithmetic and Logical Unit), timing and control unit and Registers (shown in the following figure).