Coding Instructions

Coding Instructions

The '+' or '-' in an equation is called an (a)_______ and it performs on two (b)_______. In the same way, computers use these in assembly and machine code.

The operator defines what process will be happening:

What are they?

The registers are defined by binary numbers too:

What are they?

But what does each process mean?

Can you give an example?

00001 XXX YYYYYYYY:
ADD value in YYYYYYYY to register XXX

00001 001 00001111, ADD the value 00001111 [15] to register B:
ADD B, 15

00011 XXX:
DECrement [subtract 1 from the] value in register XXX

00011 011, DECrement 1 from register D:
DEC D

000101 XXX YYYYYYYY:
MOVe value in memory address YYYYYYYY into register XXX

00101 000 10000000, MOVe value in memory address 00001000 [8] to register A: MOV A, [8]