Problem – Write an assembly language code for calculating the nth power of a number using 8085 microprocessor.
Input : Base=>02H Exponent=>03H Output :08H
In 8085 microprocessor, no direct instruction exists to multiply two numbers, so multiplication is done by repeated addition as 4*4 is equivalent to 4+4+4+4(ie 4 times).
Load 02H(base) to register B and 03H(exponent) to register C -> set D register to 02H -> Add 02H B(ie 2) times -> D register now contains 04H -> Add 04H B(ie 2) times -> D register now contains 08H -> Output is 08H.
- Load the base into register B and exponent into register C.
- To start multiplication set D to 01H.
- Jump to step 7.
- Decrements C.
- Jump to step 3 till value of C>0.
- Take memory pointer to next location and store result.
- Load E with contents of B and clear accumulator.
- Repeatedly add contents of D to accumulator E times.
- Store accumulator content to D.
- Go to step 4.
|2000H||Base||Data Byte for base|
|2001H||Exponent||Data Byte for exponent|
|2002H||Result||Result of factorial|
|2003H||LXI H, 2000H||Load data from memory|
|2006H||MOV B, M||Load base to B register|
|2007H||INX H||Increment memory|
|2008H||MOV C, M||Load exponent to C register|
|2009H||MVI D, 01H||Set D register to 1|
|200BH||POWER_LOOP||CALL MULTIPLY||Subroutine call for multiplication|
|200EH||DCR C||Decrement C|
|200FH||JNZ POWER_LOOP||Call power_loop till C becomes 0|
|2012H||INX H||Increment memory|
|2013H||MOV M, D||Store result in memory|
|2100H||MULTIPLY||MOV E, B||Transfer contents of B to E|
|2101H||MVI A, 00H||Clear accumulator to store result|
|2103H||MULTIPLYLOOP||ADD D||Add contents of D to A|
|2104H||DCR E||Decrement E|
|2105H||JNZ MULTIPLYLOOP||Repeated addition|
|2108H||MOV D, A||Transfer contents of A to D|
|2109H||RET||Return from subroutine|
- Set register B with base and register C with exponent.
- Set register D with base by calling MULTIPLY subroutine one time.
- Decrement C and add D to itself B times by calling MULTIPLY subroutine.
- Repeat the above step till C reaches 0 and then exit the program.
- The result is obtained in D register which is stored in memory
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