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Questions and Answers
What is the purpose of immediate addressing mode?
What is the purpose of immediate addressing mode?
In Memory Direct Addressing, what does the instruction 'LDA 850FH' do?
In Memory Direct Addressing, what does the instruction 'LDA 850FH' do?
What does Register Direct Addressing involve?
What does Register Direct Addressing involve?
Which type of addressing mode copies the content of one register to another?
Which type of addressing mode copies the content of one register to another?
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What is the main function of machine control operations in microprocessor?
What is the main function of machine control operations in microprocessor?
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In addressing modes, what does Immediate Addressing mode primarily focus on?
In addressing modes, what does Immediate Addressing mode primarily focus on?
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What does the CY flag indicate when set to 1?
What does the CY flag indicate when set to 1?
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Which flag indicates that the result in the accumulator contains an even number of 1s?
Which flag indicates that the result in the accumulator contains an even number of 1s?
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What is the function of the Stack Pointer register?
What is the function of the Stack Pointer register?
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In 2’s complement representation, what does a 1 in bit D7 of the accumulator indicate?
In 2’s complement representation, what does a 1 in bit D7 of the accumulator indicate?
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Which register deals with sequencing the execution of instructions?
Which register deals with sequencing the execution of instructions?
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When is the AC flag set to 1?
When is the AC flag set to 1?
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What type of operations do 8085 microprocessor instructions classified based on functionality include?
What type of operations do 8085 microprocessor instructions classified based on functionality include?
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Which type of operation involves copying data from a source to a destination without altering the source content?
Which type of operation involves copying data from a source to a destination without altering the source content?
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In 8085 microprocessor, which operation can perform functions like AND, OR, and EXOR?
In 8085 microprocessor, which operation can perform functions like AND, OR, and EXOR?
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Which group of instructions in 8085 microprocessor can be used to transfer program sequence from one memory location to another conditionally or unconditionally?
Which group of instructions in 8085 microprocessor can be used to transfer program sequence from one memory location to another conditionally or unconditionally?
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What type of microprocessor operation utilizes the accumulator for storing one of the operands and the result?
What type of microprocessor operation utilizes the accumulator for storing one of the operands and the result?
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Which group of instructions in 8085 microprocessor involves copying data from one register to another without modifying the source register?
Which group of instructions in 8085 microprocessor involves copying data from one register to another without modifying the source register?
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Study Notes
Machine Control Operations
- Instructions in this group control execution of other instructions and operations like interrupt, halt, etc.
Instruction Set Classification
- Classified based on length:
- One-byte instructions: machine code is one byte
- Two-byte instructions: machine code is two bytes
- Three-byte instructions: machine code is three bytes
- Classified based on addressing modes:
- Immediate Addressing: operand is part of the instruction and stored in the register mentioned in the instruction
- Memory Direct Addressing: moves data between a memory location and register
- Register Direct Addressing: transfers a copy of a byte or word from source register to destination
Addressing Modes
- Immediate Addressing:
- operand is a part of the instruction
- example: MVI A, 9AH
- Memory Direct Addressing:
- moves data between a memory location and register
- example: LDA 850FH
- Register Direct Addressing:
- transfers a copy of a byte or word from source register to destination
- example: MOV B, C
Flags and Registers
- Accumulator (A):
- 8-bit register, part of ALU
- stores 8-bit data for arithmetic and logical operations
- result of operation is stored in it
- Flags:
- CY (Carry flag): set to 1 if result is larger than 8-bit
- Z (Zero flag): set to 1 if result is zero
- S (Sign flag): a copy of bit D7 of the accumulator
- AC (Auxiliary Carry flag): set to 1 when a carry result from bit D3 and passes to bit D4
- P (Parity flag): set to 1 when the result in accumulator contains even number of 1s
- Program Counter (PC):
- 16-bit register
- deals with sequencing the execution of instructions
- points to memory address from which next byte is to be fetched
- Stack Pointer (SP):
- 16-bit register
- used as a memory pointer
- points to the memory location in R/W memory, called Stack
Bus Organization of 8085
- Microprocessor performs four operations:
- Memory Read: reads data from memory
- Memory Write: writes data into memory
- I/O Read: accepts data from input device
Instruction Set
- A group of instructions that a microprocessor supports
- Classified based on functionality:
- Data transfer operations
- Arithmetic operations
- Logical operations
- Branching operations
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Description
Explore the classification of MICROPROCESSOR 8085 instruction set based on functionality, length, and operand addressing. Learn about the different types of instructions supported by a microprocessor and how they are represented in machine code and mnemonics.
