10. Assembly

Question 1

MOV

Answer 1

The MOV instruction copies the data item referred to by its second operand (register contents, memory contents, or a constant value) into the location referred to by its first operand (a register or memory).

Question 2

LDR

Answer 2

LDR copies the expression or label-expression referred in the second operand into the memory location referred by its first operand.

It can pass either a value or a memory address or a value indicated in memory address.

Question 3

STR

Answer 3

Stores the value referred to the first operand onto the second operand’s memory location.

Question 4

Give two limitations of using assembly language to code a program.

Answer 4

• It’s much slower to code in assembly than a HLL. For example, a one line function in HLL is equivalent to multiple in assembly.
• Very easy to make mistakes and can be rather difficult to find the errors.