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Microprocessor Articles
Page 17 of 42
8085 program to add even parity to a string of 7 bit ASCII characters.
Here we will see how to add even parity to 7-bit ASCII string using 8085.Problem StatementWrite a program to add even parity to a string of 7 bit ASCII characters. The length of the string is in memory location 8040 H and the string itself begins at memory location 8041 H. Place even parity in the most significant bit of each character.Discussion8085 has parity flat. that flag will be used to check and assign parity with each ASCII character. At first we will clear the most significant bit by masking the number with 7FH. Then use OR instruction, as this ...
Read More8085 program to implement the following function (a*b) + (c*d)
Here we will see how to implement mathematical function using 8085.Problem StatementWrite a program to implement the following function (a*b) + (c*d) and store the result in memory locations 8204 and 8205. Perform multiplication by using a subroutine. Here a, b, c and d numbers are stored at memory locations 8200H, 8201H, 8202H and 8203 respectively.DiscussionMultiplication instruction is not present in the 8085. So we have to use subroutine to perform multiplication. In this subroutine, it takes number from memory pointed by HL pair, and return result into DE register pair. After multiplying two parts, the intermediate results are stored, ...
Read More8085 program for running light with delays using lookup table.
Here we will see how we can implement running light with some delays using 8085.Problem StatementWrite 8085 program to implement running light display with appropriate delays using lookup table stored from memory location 8100H on words.DiscussionThe patterns are stored at location 8100 onwards. We are using 8255 port IC to display the content in LED displays. After displaying, it calls the delay to wait for some time and call the next byte from memory to display. So the display pattern will be like below - ProgramAddressHEX CodesLabelsMnemonicsComments800031, 00, 82START:LXI SP, 8200 HInitializing the SP80030E, 15 MVI C, 14 HInitializing the counter800521, 00, ...
Read More8085 program to transfer a block in reverse order
Here we will see how we transfer a block of data in reverse order using 8085.Problem StatementWrite 8085 program to transfer a block of N-bytes in reverse order. The block is stored at location 8001 onwards, the size of the block is stored at 8000. The block will be moved at location 9000 onwards.DiscussionTo solve this problem, we are taking the size of the block at first. The DE register pair is set to point at destination address 9000H. The HL pair is set to point to the last element of the block. If the block size is 0A, then ...
Read More8085 program to unpack 16-bit BCD, and store consecutive locations
Here we will see we can take 16-bit BCD data from memory and unpack it, then store into memory using 8085.Problem StatementWrite 8085 program to take 16-bit BCD number from memory then store each digit by unpacking into different locations.DiscussionTo solve this problem, we will create one subroutine, that can unpack 1-byte BCD number and store into memory, then we will use that subroutine for two times to store 16-bit data. The subroutine will cut the numbers by masking upper nibble and lower nibble, and store into memory.Input1234 in the DE register pairFlow Diagram ProgramAddressHEX CodesLabelsMnemonicsCommentsF00031, 00, FC LXI SP, FC00Initialize stack ...
Read More8085 program to take all data except 00H from an array
Here we will see we can take all numbers which are not 00H from an array using 8085.Problem StatementWrite 8085 program to take all numbers which are not 00H from array, and store them into different location. Numbers are stored at 8001 onwards, 8000 is holding the size of array, the results will be stored from 9000.DiscussionTo solve this problem, we are taking the number from memory, then perform OR operation on the number and 00H. If the zero flag is enabled, then we can understand that the number was 00, so we just ignore that. Otherwise we just store ...
Read More8085 program to add two consecutive bytes of an array
Here we will see how we can add two consecutive elements in an array using 8085.Problem StatementWrite 8085 program to add two consecutive elements of an array and store them in the same location. The carry will be placed at bottom of the other byte. The numbers are stored from location 8001. The size of array is stored at 8000.DiscussionHere we will solve this problem by using one subroutine. That will add two consecutive numbers and stored them into correct position. That subroutine will be called multiple times to add all consecutive pairs. The task will be followed half of ...
Read More8085 program to subtract two consecutive bytes of an array
Here we will see how we can subtract two consecutive elements in an array using 8085.Problem StatementWrite 8085 program to subtract two consecutive elements of an array and store them in the same location. The results will be placed at the same location from where they are taken. The numbers are stored from location 8001. The size of array is stored at 8000.DiscussionHere we will solve this problem by using one subroutine. That will subtract two consecutive numbers and stored them into correct position. That subroutine will be called multiple times to subtract all consecutive pairs. The task will be ...
Read More8085 program to take all numbers which are in range 3CH and 64H in an array
Here we will see we can take all numbers which are in range 3CH and 64H from an array using 8085.Problem StatementWrite 8085 program to take all numbers which are greater or equal to 3CH, and lesser than 64H from an array. Numbers are stored at 8001 onwards, 8000 is holding the size of array, the results will be stored from 9000.DiscussionTo solve this problem, we will take the numbers from memory. Then compare it with 3C. If the Carry flag is set, then it indicates that the number is less than 3C, so just skip it. otherwise compare it ...
Read More8086 program to determine modulus of first array elements corresponding to another array elements\\n
In this program we will see how to perform modulus of the first array corresponding to the next array.Problem StatementWrite 8086 Assembly language program perform modulus of the first array corresponding to the next array.DiscussionIn this example there are two different arrays. The arrays are stored at location 501 onwards and 601 onwards. The size of these two arrays are stored at offset location 500. We are taking the array size to initialize the counter, then by using loops we are getting the modulus of the elements one by oneInputAddressData……500045010F5020B5030550408……601046020A6030260403……Flow DiagramProgram MOV SI, 500 ;Point Source index ...
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