Questions and Answers
What is the purpose of the flags in the flag register?
To indicate the result of arithmetic and logical operations
What is the function of the Carry flag?
To handle the carry or borrow from one word to another
What type of microprocessor is 8085?
Accumulator-based microprocessor
When data is read from an input port, where is it first moved?
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What is the number of flip-flops in a flag register?
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What is the purpose of the Auxiliary Carry flag?
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What is the primary function of the Temporary Register (W and Z)?
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What is the function of the flag register?
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What is the purpose of the accumulator register?
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What happens to data when it is sent to an output port?
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What is the purpose of the Parity flag?
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What is the significance of the Zero flag?
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What is the size of the Temporary Register (W and Z)?
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How can the flags be used in decision making?
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During an arithmetic and logic operation, what is the role of the Temporary Register (W and Z)?
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Who has access to the Temporary Register (W and Z)?
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What is the primary function of general purpose registers?
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How many general purpose registers are available in the 8085 microprocessor?
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What is the purpose of register pairs in the 8085 microprocessor?
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What is true about the general purpose registers in the 8085 microprocessor?
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What type of data can be stored in a single general purpose register in the 8085 microprocessor?
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What is the advantage of using general purpose registers?
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What operation can be performed directly on the registers in the 8085 microprocessor?
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What is the role of the general purpose registers in a program?
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Study Notes
Flag/Status Registers
- A register consisting of five flip-flops, each holding the status of different states separately, is known as a flag register.
- Each flip-flop is called a flag.
- The flags include Sign (S), Zero (Z), Auxiliary Carry (AC), Parity (P), and Carry (CY).
- The state of flags indicates the result of arithmetic and logical operations, which can be used for decision-making processes.
Carry Flag
- The Carry flag is set to 1 if the last operation generates a carry; otherwise, it's 0.
- This flag handles the carry or borrow from one word to another.
- The Carry flag is used to store 8-bit data and perform arithmetic and logic operations.
Accumulator
- The accumulator is a special-purpose register used to store 8-bit data and perform arithmetic and logic operations.
- The accumulator is used when data is read from an input port or sent to an output port.
Temporary Register (W and Z)
- The temporary registers W and Z are 8-bit operand registers not accessible to the programmer.
- During program execution, the 8085A places data into these registers for a brief period.
- These registers are used by the control unit during arithmetic and logic operations.
General Purpose Registers
- General-purpose registers are used to hold or store data, results of arithmetic and logical operations, and addresses of data memory temporarily during program execution.
- These registers are available to the user and can be reprogrammed by the user.
- The 8085 microprocessor has six 8-bit general-purpose registers: B, C, D, E, H, and L.
- These registers can be used individually to store 8-bit and 16-bit data with register pairs.
- The valid pairs in 8085 microprocessor registers are BC, DE, and HL.
- Data can be directly added or transferred from one register to another.
