Question

1. Suppose you found your dream job working on an 8-bit computer/microcontroller and working with assembly (which includes writing assembly from scratch). Also, suppose your project manager wants the 8-bit processor to able to handle fixed-point arithmetic operations that include addition, subtraction, and multiplication. Assume you can perform division with the combination of previously mentioned instructions.

The fixed-point number representation is eight bits and would need to represent numbers between

-2d = 1000 0000 And Max number = 0111 1111 = 2^0 + (2^-1) + (2^-2) + (2^-3) + (2^-4) + (2^-5) + (2^-6) = 1.984375

This would mean that the weights on the bits are:

-2, 2^0, 2^-1, 2^-2, 2^-3, 2^-4, 2^-5,2^6 (total of 8 bits)

Do you need to implement more instructions?

Why or why not? Give examples to justify your answer.

Answer 1

8-bit microcontroller uses the 8 bits data to perform operation for example: 8051/8031 etc.

In 8 bit microcontroller we perform programming using instruction sets which are defined for particular operation in the library( assembly language) of microcontroller. In assembly language the code given to instruction set is given an abbrevation i.e MNEMONICS.

It perform addition and subtraction by loading data in memory and then in accumulator and using instruction set ADD and SUB.But for performing division it uses more tham add or sub instruction

for eg : program of division of two number

Here we use certain instruction set:

• for loadind data into memory mnemonics is LXI
• for moving data from one memory to other mnemonics is MOV
• for Increment mnemonics is INX
• for jump to other memory location if carry flag is one mnemonics is JC
• for subtraction mnemonics is SUB

so we requires more instruction set for implementaion of division in 8-bit microcontroller