8085 program to count number of once in the given 8-bit number

In this program we will see how to count number of 1's in an 8-bit number.

Problem Statement

Write 8085 Assembly language program to count number of 1s in 8-bit number stored atlocation 8000H.

Discussion

In this program we areusing the rotate operation to count the number of 1's. As there are8 different bits in 8-bit number, then we are rotating the numbereight times. we can use RRC or RLC. Here we have used the RRCinstruction. This instruction sends the LSb to MSb also to carryflag. So after each iteration we can check the carry status to getthe count of 1s.

If the number is DA (11011010) then the answer will be 5, as there are five 1s in the number.

Input

Flow Diagram

Program

Output