Problem
Write an ALP for 8051 microcontroller to multiply two numbers. Assume multiplicand is stored in internal memory location 40H and multiplier in memory location 41H. Store the LB and HB of the result in memory location 42H and 43H respectively.
Algorithm
Step 1: Load multiplicand from internal memory 40h to accumulator.
Step 2: Load multiplier from 41h into register B, the address of register b is F0h
Step 3: Multiply A and B
Step 4: Store the lower byte of result from accumulator to memory address 42h.
Step 5: Store the higher byte of result from register B to memory address 43h.
Step 6: Stop
Flowchart
Program
MOV A, 40h ; Copy the content of 40h into accumulator
MOV 0F0h, 41h ; Copy content of 41h into register B
MUL AB ; Multiply contents of Accumulator and B register
MOV 42H, A ; Copy the lower byte of result from accumulator to 42h
MOV 43H, 0F0h ; Copy the higher byte of result from B register to 43h
STOP: AJMP STOP ; Stop
