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BRANCH-E&TC

SEM -4th

SUBJECT-MICROPROCESSOR & MICROCONTROLLER

TOPIC-TYPES OF INSTRUCTION

TOPIC-8085 MICROPROCESSOR

FACULTY- ARADHANA DAS

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Programming of addition of 2 8 bit number

Memory Address

Opcord

Mnemonics

4100

3A

LDA 4150

4101

50

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4102

41

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4103

47

MOV B,A

4104

3A

LDA 4151

4105

51

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4106

40

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4107

80

ADD B

4108

32

STA 4152

4109

52

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410A

41

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410B

76

HLT

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  • Explanation –
  • A is an 8-bit accumulator which is used to load and store the data directly
  • LDA is used to load accumulator direct using 16-bit address (3 Byte instruction)
  • add is used to addition content of accumulator (1 Byte instruction)
  • STA is used to store accumulator direct using 16-bit address (3 Byte instruction)
  • MOV is used to move data register A to B immediately (1Byte instruction)
  • HLT is used to halt the program

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