8085 Micro-Processor Programs

One’s compliment using 8085

Ø   An Assembly Language Program to find one’s compliment using 8085?

Algorithm

1)      Start the program by loading the data to Accumulator.

2)      Invert ones to zeros and zeros to ones.

3)      Store the result.

4)      Terminate the program.

Program

MEMORY	LABEL	MNEMONIC	HEX CODE	COMMENT
4200		LDA 4500	3A	Load Accumulator with data in the location 4500
4201			00
4202			45
4203		CMA	2F	Compliment Accumulator content
4204		STA 4100	32	Store the result in the memory location 4100
4205			00
4206			41
4207		HLT	76	Program ends

Observation

Input at           4500    :           FF_H

Output at         4100    :           00_H

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Two’s compliment using 8085

Ø   An Assembly Language Program to find two’s compliment using 8085?

Algorithm

1)      Start the program by loading the data to Accumulator.

2)      Invert ones to zeros and zeros to ones.

3)      Increment this inverted number by 1.

4)      Store the result.

5)      Terminate the program.

Program

MEMORY	LABEL	MNEMONIC	HEX CODE	COMMENT
4200		LDA 4500	3A	Load Accumulator with data in the location 4500
4201			00
4202			45
4203		CMA	2F	Compliment Accumulator content
4204		INR A	3C	Increment accumulator content.
4205		STA 4100	32	Store the result in the memory location 4100
4206			00
4207			41
4208		HLT	76	Program ends

Observation

Input at           4500    :           7F_H

Output at         4100    :           81_H

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