Engineering Answers

Explain the Memory stack organization of 16 locations of stack( 0 to 15). take the initial value of the

stack pointer is SP = 0E in Hex. Explain the following push and pop instructions through the Memory

stack organization diagram.

(1) PUSH R5 WHERE R5 = XX in Hex

(2) POP R4 WHERE R4 = (XX + 3 ) Hex for example roll no 64 is having the data in R5 = 64

Hex and R4 is ( 64+3 = 67 Hex) [5 marks]

Design a circuit of General register organization in which 4 registers are there from R0 to R3.

(a) Perform the following microoperation and explain the operation in the steps through the

diagram properly: - AND R3 ,R3 ,R1 .

(b) Explain the control word as per the register configuration given above. [10 marks]

Explain addressing modes in detail with example of each.

The unique addresses assigned to the four registers (R11,R12,13,R14) of the I/O interface are equal to the XX3 , XX7 , XXB and XXF in Hex . Where XX is hex digits equal to your roll no . (if student is having roll no 45 than address are 453 ,457 ,45B , 45F in Hex ) .Show the well labeled external circuit that must be connected between and 12-bit I/O address from the CPU and the CS, RSI, and RS0 Inputs of the Interface.

Find the values of the flags (carry ,sign ,zero, overflow) of the processor status register for the given example of two 8 bit no’s in Hex (A7 + EF) and draw the circuit diagram also.

Explain the addressing modes in detail with the help of example of each?