0
8085 Microprocessor
Architectural Differences betweenSAP1 And SAP2• 16 bit program Counter(16-bit address bus )• Loadable Program Counter(JMP ...
InstructionsMemory Reference Instruction :LDA , STA, MVIRegister Instruction:MOV, ADD, SUB, INR, DCRLogical Instruction:OR...
Other Topics• Flags• T-State• Conditional Jumps
Instruction affecting flagArithmetic and logical instructions:(ADD,SUB,INR,DCR, ANA/ANI,ORA/ORI, XRA/XRI)
What you should know!!!• Architecture• Instructions• Basic Programming(Refer your books for several programmingexamples )
Bonus QuestionWALP to divide 41H by 10H.(Hint: Repetitive subtraction. You may need useSign flag.)
80858085Architecture
ALUBoth Arithmetic and Logical Operation:Operation PerformedAddition, Subtraction, Increment, Decrement, Logical AND, Logi...
FlagsFive Flags Available in 8085Zero Flag(Z), Carry Flag(C), Auxiliary Carry(A),Sign Flag(S), Parity Flag (P)
Timing and Control Signals• The timing and control unit synchronizes allthe microprocessor operations with the clockand ge...
INSTRUCTION REGISTER & DECODER:• When an instruction is fetched from memoryit is placed in instruction register. Then it i...
REGISTER ARRAY:• Apart from Accumulator (A-register), there aresix general-purpose programmable registers• B, C, D, E, H a...
Register Array:STACK POINTER (SP):• The stack pointer SP, holds the address of thetop of the stack.• The stack is used to ...
Register Array:PROGRAM COUNTER (PC):The program counter (PC) keeps track of programexecution. To execute a program the sta...
Address Bus• Consists of 16 address lines: A0 – A15• Operates in unidirectional mode: The addressbits are always sent from...
Data Bus• Consists of 8 data lines: D0 – D7• Operates in bidirectional mode: The data bitsare sent from the MPU to periphe...
8085 microprocessor
Upcoming SlideShare
Loading in...5
×

8085 microprocessor

2,883

Published on

a quick and easy note on microprocessor.

Published in: Education, Technology
0 Comments
3 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
2,883
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
113
Comments
0
Likes
3
Embeds 0
No embeds

No notes for slide

Transcript of "8085 microprocessor"

  1. 1. 8085 Microprocessor
  2. 2. Architectural Differences betweenSAP1 And SAP2• 16 bit program Counter(16-bit address bus )• Loadable Program Counter(JMP instruction)• 2-input port , 2-output port• 64k Memory• Memory Data Register(MDR)• Temp, B, and C registers• Arithmetic and Logical Operations• Flags (Zero Flag and Sign Flag)• 8-bit Opcode,42 Instruction• Bidirectional Registers
  3. 3. InstructionsMemory Reference Instruction :LDA , STA, MVIRegister Instruction:MOV, ADD, SUB, INR, DCRLogical Instruction:ORA/ORI, ANA/ANI, XRA/XRI,CMAJump and Return :JMP/JZ/JNZ/JM and CALL/RETOthers: IN, OUT, HLT, NOP, RAR, RAR
  4. 4. Other Topics• Flags• T-State• Conditional Jumps
  5. 5. Instruction affecting flagArithmetic and logical instructions:(ADD,SUB,INR,DCR, ANA/ANI,ORA/ORI, XRA/XRI)
  6. 6. What you should know!!!• Architecture• Instructions• Basic Programming(Refer your books for several programmingexamples )
  7. 7. Bonus QuestionWALP to divide 41H by 10H.(Hint: Repetitive subtraction. You may need useSign flag.)
  8. 8. 80858085Architecture
  9. 9. ALUBoth Arithmetic and Logical Operation:Operation PerformedAddition, Subtraction, Increment, Decrement, Logical AND, Logical OR, Logical XOR, Compare,Complement, Left/ Right Shift
  10. 10. FlagsFive Flags Available in 8085Zero Flag(Z), Carry Flag(C), Auxiliary Carry(A),Sign Flag(S), Parity Flag (P)
  11. 11. Timing and Control Signals• The timing and control unit synchronizes allthe microprocessor operations with the clockand generates the control signals necessaryfor communication between themicroprocessor and peripherals.
  12. 12. INSTRUCTION REGISTER & DECODER:• When an instruction is fetched from memoryit is placed in instruction register. Then it isdecoded and encoded into various machinecycles.
  13. 13. REGISTER ARRAY:• Apart from Accumulator (A-register), there aresix general-purpose programmable registers• B, C, D, E, H and L.• They can be used as 8-bit registers or paired tostore l6-bit data. The allowed pairs are B-C,D-Eand H-L.• The temporary registers W and Z are intendedfor internal use of the processor and it cannot beused by the programmer.
  14. 14. Register Array:STACK POINTER (SP):• The stack pointer SP, holds the address of thetop of the stack.• The stack is used to save the content ofregisters during the execution of a program.
  15. 15. Register Array:PROGRAM COUNTER (PC):The program counter (PC) keeps track of programexecution. To execute a program the startingaddress of the program is loaded in programcounter. The PC sends out an address to fetch abyte of instruction from memory and increment itscontent automatically. Hence, when a byte ofinstruction is fetched, the PC holds the address ofthe next byte of the instruction or next instruction.
  16. 16. Address Bus• Consists of 16 address lines: A0 – A15• Operates in unidirectional mode: The addressbits are always sent from the MPU toperipheral devices, not reverse.• 16 address lines are capable of addressing atotal of 216 = 65,536 (64k) memory locations.• Address locations: 0000 (hex) – FFFF (hex)
  17. 17. Data Bus• Consists of 8 data lines: D0 – D7• Operates in bidirectional mode: The data bitsare sent from the MPU to peripheral devices,as well as from the peripheral devices to themicroprocessor.• Data range: 00 (hex) – FF (hex)
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×