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Here we will see one 8085 Microprocessor program. In this program we will see how to sort a sequence of numbers using selection sort.

**Problem Statement **−

Write an 8085 Assembly language program to sort a given sequence using selection sort in ascending order. The numbers are stored at 8001H onwards. 8000H is holding the block size.

**Discussion **−

In the selection sorting technique, we will choose the minimum or the maximum term from a set of numbers. In this case we are considering the sorting in ascending order, so we are choosing the minimum number. By taking the minimum number, we are swapping it with the element of currently pointed location. In each pass the minimum number of the sub block is placed at the correct position.

This program has two subroutines. The first subroutine will check the minimum number in a set of numbers, and the second subroutine will be used to swap the numbers.

Address | Data |
---|---|

… | … |

8000 | 06 |

8001 | 22 |

8002 | 55 |

8003 | 33 |

8004 | 66 |

8005 | 44 |

8006 | 11 |

… | … |

** **

** **

Address | HEX Codes | Labels | Mnemonics | Comments |
---|---|---|---|---|

F000 | 31, 00, 90 | LXI SP,9000H | Initialize Stack Pointer | |

F003 | 21, 00, 80 | LXI H,8000H | Point to get the block size | |

F006 | 4E | MOV C,M | Get the count | |

F007 | 23 | DO | INX H | Point to next location to get block |

F008 | 7E | MOV A,M | Load the element to A | |

F009 | CD, 18, F0 | CALL MIN | Find the minimum | |

F00C | BE | CMP M | Compare M and A | |

F00D | CA, 13, F0 | JZ GO | if Z = 1, they are same, skip swapping | |

F010 | CD, 2A, F0 | CALL SWAP | Swap minimum and current content | |

F013 | 0D | GO | DCR C | Decrease C by 1 |

F014 | C2, 07, F0 | JNZ DO | If Z = 0, go to Do | |

F017 | 76 | HLT | Terminate the program | |

F018 | E5 | MIN | PUSH H | Push HL into Stack |

F019 | C5 | PUSH B | Push BC into stack | |

F01A | 0D | DCR C | Decrease C by 1 | |

F01B | 23 | LOOP | INX H | Point to next location |

F01C | BE | CMP M | Compare memory data with A | |

F01D | DA, 23, F0 | JNC SKIP | If CY = 0, jump to SKIP | |

F020 | 7E | MOV A,M | Update the value of A | |

F021 | 54 | MOV D,H | Copy H to D | |

F022 | 5D | MOV E,L | Copy L to E | |

F023 | 0D | SKIP | DCR C | Decrease C by 1 |

F024 | C2, 1B, F0 | JNZ LOOP | If Z = 0, go to Loop | |

F027 | C1 | POP B | Pop BC from stack | |

F028 | E1 | POP H | Pop HL from stack | |

F029 | C9 | RET | Return from subroutine | |

F02A | F5 | SWAP | PUSH PSW | Store AF into stack |

F02B | C5 | PUSH B | Push BC into stack | |

F02C | 1A | LDAX D | A = get data from location pointed by DE | |

F02D | 47 | MOV B,A | Copy A to B | |

F02E | 7E | MOV A,M | get data from location pointed by HL | |

F02F | 12 | STAX D | Store A content into memory pointed by DE | |

F030 | 70 | MOV M,B | Store B content to memory pointed by HL | |

F031 | C1 | POP B | Pop BC from Stack | |

F032 | F1 | POP PSW | Pop AF from stack | |

F033 | C9 | RET | Return from swap |

** **

Address | Data |
---|---|

… | … |

8001 | 11 |

8002 | 22 |

8003 | 33 |

8004 | 44 |

8005 | 55 |

8006 | 66 |

… | … |

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