Lecture 3: Types of Registers
There are 14 types of registers in CPU
Counts, used in loop
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CPU
Input / output, Operations, a, ax, eax, rax
Holds address of data
Counts, used in loop
Holds data for output
ah al
a
bh bl
bx
ch cl
cx
dh dl
dx
cs
ds
ss
es
si
di
ip
sp
f
bp
Holds address of data segment
Points the source operand
Holds the next instruction
Points current top of stack
<- Holds current status of the program
Base of the top of stack
Holds address of code segment
Holds address of data segment
Holds address of stack segment
Points the destination operand
1. Accumulator
General
Purpose
Registers
Segment
Registers
Index
Registers
Special
Purpose
Registers
2. Base
3. Counter
4. Data
5. Code Segment
6. Data Segment
7. Stack segment
8. Extra segment
9. Source Index
10. Destination Index
11. Instruction Pointer
12. Stack Pointer
13. Flag registers
14. Base pointer
Stack
Add dl, bl
Add 3, bl
Add dl, 3
1
1
1
There are 14 types of registers
10101010 10101010
Low
High
X = Extended to 16 bits
E = extended to 32 bits
R = Rich Register to 64 bits
Eax Rax
ax
b, bx, ebx, rbx
cx, ecx, rcx
d, dx, edx, rdx
top
0
Carry
