It takes operand from the 8 bit temporary register and 8 bit accumulator. A 8085 microprocessor, is a second generation 8-bit microprocessor and is the base for studying and using all the microprocessor available in the market. The 8085 is an accumulator based microprocessor which means the data being used for operation and the results of the ALU are stored in the accumulator. It is set, when the operation performed in the ALU results in zero(all 8 bits are zero), otherwise it is reset. 3.State the function of ALU in 8085. Flag register of 8085: The flags are affected by the arithmetic and logic operations in the ALU. ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of Accumulator, temporary register, arithmetic and logic circuits Accumulator, arithmetic, logic circuits and five flags Accumulator, arithmetic and logic circuits Accumulator, temporary register, arithmetic, logic circuits and five flags. One of the inputs comes from the register file (Accumulator in 8085), while the other one comes from the shifter (Temporary register). It is only capable of five [Ken Shirriff] uses the image in his explanation of how the ALU works. The flag register is connected to ALU. INTEL 8085 ARCHITECTURE . The 8085 microprocessor is an 8-bit processor available as a 40-pin IC package (shown the figure below) and uses +5 V for Arithmetic Logic Unit. In the upper left is the 8-bit arithmetic-logic unit (ALU), with the accumulator and two temporary registers (ACT and TMP). There are five flags namely Sign (S) flag, Zero (Z) flag, Auxiliary Carry (AC) flag, Parity (P) flag and Carry (CY) flag. It helps in determining if The flag register of 8085 microprocessor consists of five flags. Lower order address bus is multiplexed with data bus to minimize the chip size. The flag register is also known as Status register or Condition code register. The architecture of.8085 is shown in figure given below. After performing the operation the result is The 8085 has only 40 pins (visible around the edge of the image) to communicate with the outside world, a tiny number compared to current microprocessors with more than 1000 pins. This is in contrast to a floating-point unit (FPU), which operates on floating point numbers. The different flags and their positions in flag register are shown below: 1. When an operation is performed by ALU the result is transferred on internal data bus and status of result will be stored in flip flops. It also stores the intermediate results of the ALU. The 8-bit ALU performs arithmetic operations such as addition, subtraction, and logical operations such as AND,OR and XOR on 8 bit data at a time. OPERATIONS PERFORMED BY 8085 The ALU performs the arithmetic and logical operations. Microprocessor Objective type Questions and Answers. The internal architecture of 8085 includes the ALU, timing and control unit, instruction register and decoder, register array, interrupt control and serial I/O control. The 8085 Microprocessor is a first and perfect design microprocessor among all who was having all the operation features to use on a computer. The ALU in the ARM 7 architecture has two 32-bits inputs (As opposed to two 8-bit inputs of the 8085). It has 8 bit ALU 8 bit ALU that can perform 8 bit operations. History Of 8085 Microprocessor: The 8085 Microprocessor was designed by Intel in 1977 using NMOS technology. ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of: a. Accumulator, temporary register, arithmetic and logic circuits: b. Accumulator, arithmetic, logic circuits and five flags: c. Accumulator, arithmetic and logic circuits: d. Accumulator, temporary register, arithmetic, logic circuits and five flags This is a microscopic photograph of an 8085 processor die. The Carry Flag (CF) : In computing, an arithmetic logic unit (ALU) is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers.
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