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8085 Articles
Page 16 of 36
8085 program to print the table of input integer
In this program we will see how to generate table of an integer.Problem StatementWrite 8085 Assembly language program to generate a table of input integer. The number is stored at F050, and the table will be stored at F051 onwards.DiscussionTable generation is basically the multiplication table creation. We are taking the number and storing it to B. And initialize the counter as 0A (10 in decimal). In each step we are adding B with A and store value of A into memory, and decrease the counter by 1. These steps will repeat until the counter become 0.InputAddressData……F0504…… Flow Diagram ProgramAddressHEX CodesLabelsMnemonicsCommentsF00021, 50 ...
Read More8085 program to separate (or split) a byte into two nibbles
Here we will see how to split two nibbles of an 8-bit number.Problem StatementWrite 8085 Assembly language program to split two nibbles of an 8-bit number. Number is stored at F050, we will store result at F051 and F052.DiscussionTo get the nibbles separately, at first we are taking number into B register as a copy. Now mask upper nibble to get lower nibble and store it, then take the number from B again, mask lower nibble to get upper nibble, then rotate it four times to make it lower order nibble, after that store it to another location.InputAddressDataF05035 AddressDataF050BE Flow Diagram ProgramAddressHEX CodesLabelsMnemonicsCommentsF0003A, ...
Read More8085 program to subtract two BCD numbers
Here we will see how to perform BCD subtractions using 8085.Problem StatementWrite 8085 Assembly language program to perform BCD subtractions of tow numbers stored at location 8001 and 8002. The result will be stored at 8050 and 8051.DiscussionTo subtract two BCD numbers, we are going to use the 10s complement method. Taking the first number and storing into B, Load 99 into A then subtract the number to get the 9’s complement. After that add 1 with the result to get 10’s complement. We cannot increase using INR instruction. This does not effect on CY flag. So we have to ...
Read More8085 programs to find 2's compliment with carry | Set 2
Here we will see how to find 2’s complement with carry.Problem StatementWrite 8085 Assembly language program to find 2’s complement of a number stored in F100 with the carry, and store at F150 and F151.DiscussionIn 8085, there is CMA instruction to complement a number. Then we can add 01 with it to make it 2’s complement. While adding 01 with it, the carry may generate. We will store it to F151, and the actual complemented value will be at F150.InputAddressData……F10008…… Flow Diagram ProgramAddressHEX CodesLabelsMnemonicsCommentsF0003A, 00, F1 LDA F100Hget number from memory to AF0032F CMAget 1's complementF004C6, 01 ADI 01Increase it by 1F0066F MOV L, AStore A ...
Read More8085 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 perform ON/OFF desired output LEDs connected at the output port B.
Here we will see how to interface PORT IC with 8085.Problem StatementON/OFF desired output LEDs connected at the output port B.DiscussionHere we will see how to On/Off LEDs at port B. We are using 8255 IC for ports. The J1 and J2 connectors to connect the 8085 and 8255. The connector pin descriptions are given below. For controlling pin, we have to set the control word, that will be used in the program.Pin no. on J1/J28255 PinFunction113PC4212PC5316PC2417PC3514PC0615PC1724PB6825PB7922PB41023PB51120PB21221PB31318PB01419PB11538PA61637PA71740PA41839PA5192PA2201PA3214PA0223PA12311PC62410PC72526+5V267GND Group A and B will operate in mode 0.Using port A as input port and port B as output port. The operation mode of ...
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 ...
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