8085 Microprocessor Instructions
Test your knowledge of 8085 microprocessor instruction set including data transfer, arithmetic, logical, branch, and machine control groups.
Questions
Which of the following instructions provides a means of loading any register pair with a two byte value?
- XCHG Instruction
- LXI Instruction
- ADD Instruction
- SUBTRACT Instruction
- None of these
______________ group of instructions provide 8085 with the ability to move data around inside the RAM, between the RAM and the register of the microprocessor and between registers within the microprocessor.
- Machine control group
- Branch group
- Logical group
- Data transfer group
- Arithmetic group
Which of the following instructions allows program flow to be altered by loading the contents of the two bytes following the instruction to be loaded into the program counter?
- Jump
- LXI
- SUBTRACT
- LDA and STA
- None of the above
Which of the following instructions allows a programmer to accept input data as BCD, process it in the accumulator using essentially hexadecimal arithmetic, and then convert the result back into BCD?
- Carry Instruction
- Jump Instruction
- Exclusive OR Immediate
- Decimal Adjust
- Increment Instruction
Which of the following group of instructions permits a programmer to alter the flow of program execution from a normal straight line?
- Branch group
- Arithmetic group
- Data transfer group
- Logical group
- Machine control group
Which of the following instructions provides a means of adding a fixed value into the accumulator?
- ADD Instruction
- ADD Immediate
- ADD with Carry
- Decrement Instruction
- Increment Instruction
__________ instruction provides a 1's complement of the 8-bits in the A register.
- Carry Instruction
- Rotate Instruction
- Compare Instruction
- Complement Accumulator
- Jump
______________ group is a collection of miscellaneous instructions which control bodily functions of the microprocessor or provide utilities.
- Logical group
- Arithmetic group
- Machine control group
- Branch group
- None of these
__________ instruction provides a quick means of adding one to the contents of a register or memory location.
- AND Instruction
- Increment Instruction
- OR Instruction
- Decrement Instruction
- Compare Instruction
Which of the following instructions allows a linkage to permit a subroutine to be invoked with the address of the next sequential instruction saved by later reference?
- Jump Instruction
- Jump Indirect
- Restart Instruction
- CALL Instruction
- Return Instruction
Which of the the following instructions allows a programmer to manipulate the system stack?
- PSW Instruction
- Exchange Stack Top
- PUSH and POP
- I/O Instruction
- Interrupt Instruction
Which of the following instructions provides a means of subtracting a fixed value into the accumulator?
- Compare Immediate
- Add Immediate
- Subtract Immediate
- AND Immediate
- OR Immediate
_______________ instruction allows the microprocessor to communicate with the outside world.
- Rotate Instruction
- I/O Instruction
- Carry Instruction
- Jump Instruction
- None of these
_____________ group provides the 8085 with mathematical ability to manipulate 8-bit data and by judicious use of the condition codes manipulate larger values.
- Machine control group
- Branch group
- Logical group
- Arithmetic group
- Data transfer group
Which of the following instruction sets in 8085 architecture permits the HL register pair's contents to be exchanged with the DE pair?
- MVI group
- LXI instruction
- XCHG instruction
- ADD instruction
- ADD immediate
________________ instructions provide a means of moving a byte between the accumulator and a RAM address.
- LDA & STA
- LHLD & SHLD
- LDAX & STAX
- AND Instruction
- Compare Immediate