Write the register transfer sequence

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Reference no: EM131474484

Question: Write micro program to implement the solutions for Problems I, II, and III.

Problems I: Write register transfer sequences for the following new instructions on ASC. Subtract:

SUB MEM ACC ← ACC - M[MEM].

Load immediate:

LDI data ACC ← Data

Assume data are in bits 0 through 7 of the instruction.

Problem II: Write register transfer sequences for the following new instructions: JSR: Subroutine jump; use memory location 0 for storing the return address. RET: Return from subroutine.

Problem III: Write the register transfer sequence needed to implement a multiply instruction on ASC. That is:

MPY MEM ACC ← ACC*M[MEM].

Use the repeated addition of ACC to itself M[MEM] times. Assume that the product fits in one word. List the hardware changes needed (if any).

Reference no: EM131474484

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