8086 Microprocessor is an enhanced version of 8085Microprocessor that was designed by Intel in 1976. It is a 16-bit Microprocessor having 20 address lines and16 data lines that provides up to 1MB storage. It consists of powerful instruction set, which provides operations like multiplication and division easily. Intel 8086 microprocessor Architecture Flags & register Stack Management Rotate left & Rotate Right ILLUSTRATION

1. Microprocessor and interfacing 8086
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2. Contents
• Intel 8086 microprocessor Architecture
• Flags & register
• Stack Management
• Rotate left & Rotate Right
• ILLUSTRATION

3. 8086 microprocessor pin Diagram
8086 pin diagram

4. 8086 microprocessor Architecture
8086 Architecture8086 Architecture

5. Flags
1. Carry flag (CF)=0
2. Parity flag (PF)=1 +
3. Overflow flag (OF)=0
4. Zero flag (ZF)=0
5. Sign flag(SF)=0
0010 0000 0000 0000
0001 1111 1111 1111
0000 0000 0000 0001

6. Stack Management
•A declared ‘1-D Data Array’
•Memory block in the RAM
•Last In First Out
•Used for temporary storage

7. Stack Opcode
PUSH POP
Retrieves a ‘WORD’ from the stack
•POP destination
•POP CX gets the word from the
address pointed by SP
•Neither PUSH , nor POP works on
byte type registers.
Saves a ‘WORD’ in stack
•PUSH source
•Lower Byte -> Lower Address of Stack
•Higher Byte -> Higher Address of Stack
•PUSH CX will save the current value
of CX in the address pointed by SP

8. Rotate Left
Rotate Left

9. Rotate Right
Rotate Right

10. ILLUSTRATION
ILLUSTRATION OF PUSH
AX

11. ILLUSTRATION
ILLUSTRATION OF PUSH BX ILLUSTRATION OF POP CX

12. ILLUSTRATION
ILLUSTRATION OF POP AX

13. Anyone have any questions??

14. That’s all for today
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