8085 program to find maximum and minimum of 10 numbers
Problem – Write an assembly language program in 8085 microprocessor to find maximum and minimum of 10 numbers.
Example –
Minimum: 01H, Maximum: FFH
In CMP instruction:
If Accumulator > Register then carry and zero flags are reset
If Accumulator = Register then zero flag is set
If Accumulator < Register then carry flag is set
Assumption – List of numbers from 2050H to 2059H and output at 2060H and 2061H.
Algorithm –
- Maximum number is stored in B register and minimum in C register
- Load counter in D register
- Load starting element in Accumulator, B and C register
- Compare Accumulator and B register
- If carry flag is not set then transfer contents of Accumulator to B. Else, compare Accumulator with C register, if carry flag is set transfer contents of Accumulator to C
- Decrement D register
- If D>0 take next element in Accumulator and go to point 4
- If D=0, store B and C register in memory
- End of program
Program- Address Label Instruction Comment 2000H LXI H, 2050H Load starting address of list 2003H MOV B, M Store maximum 2004H MOV C, M Store minimum 2005H MVI D, 0AH Counter for 10 elements 2007H LOOP MOV A, M Retrieve list element in Accumulator 2008H CMP B Compare element with maximum number 2009H JC MIN Jump to MIN if not maximum 200CH MOV B, A Transfer contents of A to B as A > B 200DH MIN CMP C Compare element with minimum number 200EH JNC SKIP Jump to SKIP if not minimum 2011H MOV C, A Transfer contents of A to C if A < minimum 2012H SKIP INX H Increment memory 2013H DCR D Decrement counter 2014H JNZ LOOP Jump to LOOP if D > 0 2017H LXI H, 2060H Load address to store maximum 201AH MOV M, B Move maximum to 2060H 201BH INX H Increment memory 201CH MOV M, C Move minimum to 2061H 201DH HLT Halt
Explanation –
- One by one all elements are compared with B and C register.
- Element is compared with maximum, if it greater than maximum then it is stored in B register. Else, it is compared with minimum and if it is less than minimum then it stored in C register.
- Loop executes 10 number of times.
- At the end of 10 iterations, maximum and minimum are stored at 2060H and 2061H respectively.
.png)