Q21GATE 2003MCQ

The following program is written for an 8085 microprocessor to add two bytes located at memory addresses 1FFE and 1FFF LXI H, 1FFE MOV B, M INR L MOV A, M ADD B INR L MOV M, A XOR A On completion of the execution of the program, the result of addition is found

🚀 Solve in Practice Mode

📖 Explanation

LXI H, 1FFE $\rightarrow$ Load 1FFE in H-L memory MOV B, M $\rightarrow$ move the content of 1FFE memory location to register B INR L $\rightarrow$ Increment the content of 'HL' by 1 (1FFE $\rightarrow$ 1FFF) MOV A, M $\rightarrow$ move content of 1FFF memory location to accumulator ADD B $\rightarrow$ (A $\rightarrow$ A+B) INR L $\rightarrow$ FF+1 $\rightarrow$ 00 As result HL $\rightarrow$ 1F00 MOV M, A $\rightarrow$ move content of accumulator to memory location 1F00 XRA A $\rightarrow$ content of accumulator becomes zero

Q22GATE 2002MCQ

The logic circuit used to generate the active low chip select (CS) by an 8085 microprocessor to address a peripheral is shown in figure. The peripheral will respond to addresses in the range.

🚀 Solve in Practice Mode

📖 Explanation

\begin{matrix} A_{15} &A_{14} & A_{13} & A_{12} & A_{11} & \cdots & A_0\\ 1 & 1 & 1 & 0 & 0 &\cdots & 0\\ 1 & 1 & 1 & 0 & 1 & \cdots & 1 \end{matrix}

$\Rightarrow \;\; E000-EFFF$