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Higher Study | Digital Electronics | Microprocessors

How many bytes of bit addressable memory is present in 8051 based microcontrollers?
Which is the first company who defined RISC architecture?
When a "CALL Addr" instruction is executed, the CPU carries out the following sequential operations internally. Note: (R) means content of register R ((R)) means content of memory location pointed to by R PC means Program Counter SP means Stack Pointer
A microprocessor accepts external interrupts (Ext INT) through a Programmable Interrupt Controller as shown in the figure. Assuming vectored interrupt, a correct sequence of operations when a single external interrupt (Ext INT1) is received will be :
A portion of the main program to call a subroutine SUB in an 8085 environment is given below. \(\begin{matrix}:\\\ :\\\ \rm LXI&\rm D,DISP\\\ \rm LP:\ \ \ \ \ CALL\ \ \ \ \ \ \ \ \ &\rm SUB\ \ \ \ \ \\\ :\\\ :\end{matrix}\) It is desired that control be returned to LP + DISP + 3 when the RET instruction is executed in the subroutine. The set of instructions that precede the RET instruction in the subroutine are:
When the signal on REST IN goes low, which of the following happens in 8085?
In an 8085 microprocessor system, the following program starts at location 0100H LXI SP 00FF LXI H 0701 MVI A 20H SUB M The content of the accumulator when the program counter reaches 0107 H is
With reference to 8085 microprocessor, which of the following statements are correct? 1. The DAD instruction adds the contents of the specified register pair to the contents of the DE register pair 2. The program counter is an instruction pointer 3. Whenever an instruction uses the HL pointer, the addressing is called indirect addressing. 4. HL register pair is also called data pointer
Which of the following condition takes place when the Microcontroller 8051 is reset?
Which of the following CPU registers contains the address of the next instruction to be fetched from the main memory when the previous instruction has been successfully completed?
When a program is being executed in an 8085 microprocessor, its program counter contains
When a peripheral is connected to the microprocessor in Input Output mode, the data transfer takes place between
When 8051 Microcontroller is powered up, the stack pointer contains the value
What happens when the RET statement is executed in 8085 μp? (a) Program counter is cleared (b) Control is transferred from the subroutine to the main program (c) Returning address is loaded into the accumulator (d) Returning address is loaded into the program counter from the top of the stack The correct answer is:
In 8085 μP, the READY signal is useful when the CPU communicates with
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