microprocessor

In this post, we will give you a clear idea of how to generate the time delay using 8085 programs. Through programming time delay can be introduced and this delay will be used in different applications such as traffic signals, digital clocks, process control, and serial data transfer. Generally, a program for the delay is […]

The Opcode fetch machine cycle is the first step in the execution of any instruction. In this cycle, the microprocessor reads the opcode of an instruction from the memory. The control and status signals for this machine cycle are IO/M’ = 0, S0 =1, and S1 = 1. This differentiates it from the memory read […]

In this post, we will write one 8085 program to swap two 8-bit numbers. We will take a problem statement first and then find out the solution methods, algorithm and then will write the 8085 assembly programs to solve the problem. Program Statement: Swap the contents of memory locations 2000H and 4000H using 8085 assembly […]

In this post, we will study how to use DAA Instruction in 8085 for BCD addition. DAA is the 8085 instruction that supports BCD addition. The addition of BCD is done like binary addition, using the ADD instruction. DAA is used to convert the result of the binary sum (Available in the Accumulator) into a […]

PPI 8255 is a general-purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard, etc. We can program it according to the given condition. It can be used with almost any microprocessor. Here in this post, we will discuss the interfacing of 8255 PPI with 8085 microprocessor […]

In this post, we will discuss the Timing diagram of INX H in 8085. The timing diagram of INX B is also discussed. In the 8085 Instruction set, INX H stands for “INcrement eXtended register” and H stands for H-L register pair. This instruction will be used to add 1 to the present content of […]

In this post, we will write a program for interfacing ADC with 8085. This 8085 assembly language program will initiate ADC (Analog to Digital Converter) and store the digital data in memory. Interfacing ADC with 8085 using 8255 We have to write a program with 8085 assembly language to Initiate ADC and store the digital […]

In this post, we will write programs in 8085 Assembly language for the addition of two 16-bit numbers. In program 1, eight bit addition instructions are used (ADD and ADC) and addition is performed in two steps. First lower byte addition using ADD instruction and then higher byte addition using ADC instruction. In program 2, […]

In this post, we will write programs in 8085 Assembly Language for Packing and unpacking of BCD numbers. Packing of BCD numbers: 8085 programming Problem statement: Pack the two unpacked 4-bit single digit BCD numbers stored in memory locations C200H and C201H and store result in memory location C300H. Assume the least significant digit is […]

In this post, we will see how to convert a given Hexadecimal number into its equivalent ASCII number using the 8085 microprocessor instruction set. (HEX to ASCII conversion) Algorithm for HEX to ASCII Conversion with 8085 microprocessor Load the given data in A register and move to B register Mask the upper nibble of the […]

In this post, we will see how to convert a given Hexadecimal number into its equivalent BCD number using the 8085 microprocessor instruction set. (HEX to BCD conversion) Algorithm for HEX to BCD Conversion with 8085 microprocessor 1) Initialize memory pointer to 4150 H2) Get the Hexadecimal number in C – register3) Perform repeated addition […]

In this post, we will see how To convert two-digit packed BCD numbers in memory to the equivalent HEX number using the 8085 microprocessor program or instruction set. Algorithm for BCD to HEX Conversion with 8085 microprocessor 1) Initialize memory pointer to 4150 H2) Get the Most Significant Digit (MSD)3) Multiply the MSD by ten […]

In this post, we will see how to write a program to arrange an array of data in descending order in an 8085 microprocessor. Algorithm to Arrange an Array of data in descending order (in 8085) Initialize HL pair as memory pointer Get the count at 4200 into C register Copy it in D register […]