Registers
A
B
R0

DPTR

DPH

DPL

R1
R2

PC

PC

R3
Some 8051 16-bit Register

R4
R5
R6
R7
Some 8-bitt Registers of the
80...
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Description of SFR..
 Accumulator (E0h) – It is an 8-bit register. It is the main Input register
of ALU(Arithmatic & Logi...
Description of SFR..
 Program Counter (PC – Not Addressable) – It is an 16 bit not
addressable register that contain the ...
Instructions
• Movmov destination,source ;copy source to
destination
ex-mov a,#55h
mov r0,a
r0=a=55h

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• add- add a,source
ex-mov a,#25h
mov r1,#22h
add a,r1
a=a+r1(contents)
• Db(define byte)- db directive is the most
widely...
• Org- The org directive is used to indicate the
beginning of the address.
org 00h
org 50h
• Equ- This is used to define a...
LOOP & JUMP Instructions
Conditional Jump instructions

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jz
• Mov a,ro
jz over
mov a,r1
jz over1
--------Over: --------Over1: ---------www.technogroovy.com, Cell- +917500347448 , ...
Unconditional Jump instructions
• LJMP(long jump)-it is a 3 byte instruction.it
allows a jump to any memory location from
...
CALL instructions
• Call instruction is used to call a subroutine.it
saves the memory space.
• Types- LCALL and ACALL
• Th...
• DELAY:
MOV R3,#255
HERE: DJNZ R3,HERE
RET

• DELAY: MOV R1,#05H
LOOP1: MOV R2,#55H
LOOP2: DJNZ R2,LOOP2
DJNZ R1,LOOP1
RE...
Arithmetic/Logical instruction
• Arithmetic instructions perform several
basic operations such as addition,
subtraction, d...
Add with carry
Mov r0,#00h
Mov a,#30h
Add a,#20h
Jc next
mov r1,a
Next:inc r0
mov a,r0
mov r2,a
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Add 16 bit no.
• Add two 16 bit no,fc45h and 02ech
• Mov a,#45h
add a,#0ech
mov r0,a
mov a,#02h
addc a,#0fch
; 02+fc+1=ff
...
• SUBTRACT instruction
– SUBB subtract the value of operand from the value of
the Accumulator, leaving the resulting value...
• Division instruction
Examples:DIV AB
:divide A by B.
A=Quotient(A/B)
B=Remainder(A/B)

– Increment & Decrement
Examples:...
Logical Operation
• AND Operation
Examples:
ANL A,Rn
ANL A, Direct

:And register to accumulator
:And direct byte to accum...
• XoR Operation
Examples:

XRL A,Rn
XRL A, Direct

:Exclusive OR register to accumulator
: Exclusive OR direct byte to acc...
Addressing Mode
• The way by which the address of the operand
(source or destination) are specified in the
instruction is ...
Addressing modes
•
•
•
•
•

Immediate addressing mode
Register addressing mode
Direct addressing mode
Register indirect ad...
Immediate addressing mode
• Mov b,#40h
• Mov r5,#39h
• Mov a,#10101010b

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Register addressing mode
• Mov a,r0
• Mov r5,a
• Mov r0,b
Data between Rn register is not allowed i.e, MOV R4,R7

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Direct Addressing Mode
• Using this mode one can access internal data RAM
and SFR directly.
– Internal RAM uses addresses ...
Register indirect addressing mode
• Mov a,@r0 ; move contents of ram location
whose address is held by r0 into A.
mov @r1,...
Index Addressing Mode
• In the indexed addressing mode, only program
memory can be accessed. The program
memory can only b...
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Winter training,Readymade Projects,Buy Projects,Corporate Training

  1. 1. Registers A B R0 DPTR DPH DPL R1 R2 PC PC R3 Some 8051 16-bit Register R4 R5 R6 R7 Some 8-bitt Registers of the 8051 www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  2. 2. Projects Assistance,Project Maker,Project Report By Technogroovy Systems India Pvt Ltd www.technogroovy.com, Cell- +917500347448 , +91-7533940322 Mail : technogroovy@gmail.com www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  3. 3. Description of SFR..  Accumulator (E0h) – It is an 8-bit register. It is the main Input register of ALU(Arithmatic & Logical unit) & used in all arithmatic & logical operations. The Bits of this register can be accessed by either name of bits or by address of bits. ACC.7 ACC.6 ACC.5 ACC.4 ACC.3 ACC.2 ACC.1 ACC.0 E7h E6h E5h E4h E3h E2h E1h E0h  B (F0h) – It is also an 8-bit register. It is also the input register of ALU(Arithmatic & Logical unit) & used in multiplication & divide operations. The Bits of this register can be accessed by either name of bits or by address of bits. B.7 B.6 B.5 B.4 B.3 B.2 B.1 B.0 F7h F6h F5h F4h F3h F2h F1h F0h www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  4. 4. Description of SFR..  Program Counter (PC – Not Addressable) – It is an 16 bit not addressable register that contain the address of next instruction of program that is to be executed. DPTR (DPH,DPL – 83h,82h) - The Data Pointer (DPTR) consists of a high byte (DPH) and a low byte (DPL). Its intended function is to hold a 16-bit address. It may be manipulated as a 16-bit register or as two independent 8-bit registers. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  5. 5. Instructions • Movmov destination,source ;copy source to destination ex-mov a,#55h mov r0,a r0=a=55h www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  6. 6. • add- add a,source ex-mov a,#25h mov r1,#22h add a,r1 a=a+r1(contents) • Db(define byte)- db directive is the most widely used data directive in the assembler.it is used to define 8 bit data. Org 00h Data1: db 01010101b ;binary 35 in hex www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  7. 7. • Org- The org directive is used to indicate the beginning of the address. org 00h org 50h • Equ- This is used to define a constant without occupying a memory location. count equ 25 -------------------------mov r3,#count www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  8. 8. LOOP & JUMP Instructions Conditional Jump instructions www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  9. 9. jz • Mov a,ro jz over mov a,r1 jz over1 --------Over: --------Over1: ---------www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  10. 10. Unconditional Jump instructions • LJMP(long jump)-it is a 3 byte instruction.it allows a jump to any memory location from 0000 to ffffh. • SJMP(short jump)-it is a 2 byte instruction.it allows jump from oo to ffh. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  11. 11. CALL instructions • Call instruction is used to call a subroutine.it saves the memory space. • Types- LCALL and ACALL • The difference between ACALL and LCALL is the target address for lcall may be anywhere within the 64 kbyte address while the target address of acall must be within 2kbyte range. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  12. 12. • DELAY: MOV R3,#255 HERE: DJNZ R3,HERE RET • DELAY: MOV R1,#05H LOOP1: MOV R2,#55H LOOP2: DJNZ R2,LOOP2 DJNZ R1,LOOP1 RET www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  13. 13. Arithmetic/Logical instruction • Arithmetic instructions perform several basic operations such as addition, subtraction, division, multiplication etc. • ADD INSTRUCTION • ADD and ADDC both add the value operand to the value of the Accumulator, leaving the resulting value in the Accumulator. Examples:» ADD A,R0 » ADDC A, #data :add register to accumulator :add immediate data to Acc./carry www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  14. 14. Add with carry Mov r0,#00h Mov a,#30h Add a,#20h Jc next mov r1,a Next:inc r0 mov a,r0 mov r2,a www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  15. 15. Add 16 bit no. • Add two 16 bit no,fc45h and 02ech • Mov a,#45h add a,#0ech mov r0,a mov a,#02h addc a,#0fch ; 02+fc+1=ff mov r1,a www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  16. 16. • SUBTRACT instruction – SUBB subtract the value of operand from the value of the Accumulator, leaving the resulting value in the Accumulator. Examples:» SUBB A,R0 :subtract register from accumulator/Borrow » SUBB A, #data :subtract immediate data from Acc./Borrow MULTIPLY instruction MUL multiply the unsigned value of the by the unsigned value of the register. Examples:MUL AB :multiply A and B. www.technogroovy.com, Cell- +917500347448 , +91-7533940322 Accumulator
  17. 17. • Division instruction Examples:DIV AB :divide A by B. A=Quotient(A/B) B=Remainder(A/B) – Increment & Decrement Examples:INC A :increment accumulator. INC @Ri :increment indirect RAM DEC Rn :decrement register DEC @Ri: increment indirect RAM www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  18. 18. Logical Operation • AND Operation Examples: ANL A,Rn ANL A, Direct :And register to accumulator :And direct byte to accumulator • OR Operation Examples: ORL A,Rn ORL A, Direct :Or register to accumulator :Or direct byte to accumulator www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  19. 19. • XoR Operation Examples: XRL A,Rn XRL A, Direct :Exclusive OR register to accumulator : Exclusive OR direct byte to accumulator • Complement Operation Example: CPL A : complement accumulator. • Rotate instruction Example: RL A RR A :rotate accumulator left :rotate accumulator right • Swap instruction – SWAP A :swap nibbles within the accumulator • Exchange- xch a,r1 www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  20. 20. Addressing Mode • The way by which the address of the operand (source or destination) are specified in the instruction is known as Addressing mode. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  21. 21. Addressing modes • • • • • Immediate addressing mode Register addressing mode Direct addressing mode Register indirect addressing mode Indexed addressing mode www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  22. 22. Immediate addressing mode • Mov b,#40h • Mov r5,#39h • Mov a,#10101010b www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  23. 23. Register addressing mode • Mov a,r0 • Mov r5,a • Mov r0,b Data between Rn register is not allowed i.e, MOV R4,R7 www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  24. 24. Direct Addressing Mode • Using this mode one can access internal data RAM and SFR directly. – Internal RAM uses addresses from 00H to 7FH. – The SFR addresses exist from 80H to FFH. Examples: MOV R0,40H :move content of RAM location 40H in R0 MOV 56H,A :save content of A in RAM location 56H MOV 90H,A :save content of A in P1 (P1=90H) www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  25. 25. Register indirect addressing mode • Mov a,@r0 ; move contents of ram location whose address is held by r0 into A. mov @r1,b ; move contents of B into ram location whose address is held by r1. Note- only r0 and r1 are used,r2 –r7 are not used for this purpose. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  26. 26. Index Addressing Mode • In the indexed addressing mode, only program memory can be accessed. The program memory can only be read. • Either the DPTR or PC can be used as Index register. Examples: MOVC A, @A+DPTR :copy the code byte, found at the ROM address formed by adding A and DPTR, to A. MOVC A, @A+PC : copy the code byte, found at the ROM address formed by adding A and pc, to A. www.technogroovy.com, Cell- +917500347448 , +91-7533940322
  27. 27. Thank You Industrial Training,B tech Projects,Final Year Projects,Engineering Projects,Summer Training,Embedded Systems,Embedded Systems Project,Winter training,Readymade Projects,Buy Projects,Corporate Training,Projects Assistance,Project Maker,Project Report offered By Techogroovy Systems India Pvt Ltd , www.technogroovy.com, Cell- +91-7500347448 , +917533940322 • Mail : technogroovy@gmail.com www.technogroovy.com, Cell- +917500347448 , +91-7533940322

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