RLC, RRC, RAL, RAR, CMA, CMC, STC

1. RLC: - Each binary bit of the accumulator is rotated left by one position. Bit D7 is placed in the position of D0 as well as in the Carry flag. CY is modified according to bit D7. Any other bit is not affected.


Eg: - RLC



2. RRC: -  Each binary bit of the accumulator is rotated right by one position. Bit D0 is placed in the position of D7 as well as in the Carry flag. CY is modified according to bit D0. Any other bit is not affected.

Eg: - RRC



3. RAL: - Each binary bit of the accumulator is rotated left by one position through the Carry flag. Bit D7 is placed in the Carry flag, and the Carry flag is placed in the least significant position D0. CY is modified according to bit D7.


Eg: - RAL




4. RAR: - Each binary bit of the accumulator is rotated right by one position through the Carry flag. Bit D0 is placed in the Carry flag, and the Carry flag is placed in the most significant position D7. CY is modified according to bit D0.

Eg: - RAR



5. CMA: - The content of accumulator is complemented.
Eg: - CMA



6. CMC: - The carry flag is complemented.
Eg: - CMC



7. STC: - This instruction sets the carry flag.

Eg: - STC

29 comments:

  1. azarmadr23 September 2014 at 18:09

    difference between RLC and RAL

    ReplyDelete
    Replies
    1. Unknown5 February 2015 at 22:08

      both are bored one so no need tat

      Delete
    2. Bharath22 September 2015 at 19:04

      in rlc the left most bit d7 is shifted to carry flag and right most bit i.e.., same binary bit is shared by carry as well as in d0. but in the case of ral the bit in d7 is transferred to carry flag and the previous stored carry flag is shifted to d0. hope thats clear

      Delete
    3. Unknown22 November 2016 at 01:45

      in RAL it is supposed that data is of 9 bit D0 to D7 in addition the carry, so when RAL is executed D7 is placed in CY and Cy bit is placed in D0,
      In the other hand RLC is the the circulation is done only between DO to D7

      Delete
    4. Unknown16 October 2017 at 08:03

      thanks for clear

      Delete
    5. Unknown11 November 2017 at 04:39

      Fuck clear

      Delete
    6. Unknown11 November 2017 at 04:40

      Fuck clear

      Delete
  2. Unknown5 February 2015 at 22:08

    shaik azar badu

    ReplyDelete
  3. Unknown23 September 2015 at 10:15

    in rlc d7->carry and d7->d0
    in ral d7->carry and carry->do

    ReplyDelete
  4. Unknown23 September 2015 at 10:17

    in rlc d7->carry and d7->d0
    in ral d7->carry and carry->do

    ReplyDelete
  5. Kishor Kumar Khadka1 August 2016 at 07:44

    can anyone tell how exactly does RAL work when the data in the accumulator is [08]?

    ReplyDelete
    Replies
    1. Unknown9 August 2016 at 18:47

      08 is written as 0000 1000 if carry flag is initially reset(0) then including carry flag the number 08 can be written as
      0 0000 10000 (the left most bit is carry ) now shift each bit to the left then carry bit goes to the rightmost and the left most 0 of 0000 comes in place of carry and the number becomes:

      0 0001 0000

      But if carry bit was initiall set i.e 1 the number 08 with carry bit would be

      1 0000 10000 (the left most bit is carry )

      after RAL it would be :
      ( every bit would be shifted to left and the left most 1 would come to the rightmost)

      0 0001 0001

      Delete
    2. Unknown7 August 2017 at 10:03

      it became very helpful,good

      Delete
    3. Karne harikrishna24 February 2020 at 18:38

      Thank you for your answer

      Delete
  6. Unknown29 August 2016 at 19:30

    Difference between Reset out and Intr

    ReplyDelete
  7. Unknown17 December 2016 at 22:12

    What is the addressing mode of CMC & STC instructions

    ReplyDelete
  8. Yash Chawla2 February 2017 at 16:04

    Thank you so much, really helped me a lot in preparing for my exams.

    ReplyDelete
  9. Unknown11 November 2017 at 04:39

    No need to sit in the exam

    ReplyDelete
  10. Unknown11 November 2017 at 04:40

    No need to sit in the exam

    ReplyDelete
  11. Unknown14 December 2017 at 10:00

    This comment has been removed by the author.

    ReplyDelete
  12. Unknown14 December 2017 at 10:06

    RAL=ROTATE ACCUMULATOR LEFT THROUGH CARRY
    CY->D0 then D7->CY
    rest rotate clockwise

    RLC= ROTATE ACCUMULATOR LEFT
    D7-> CY and D0
    rest rotate clockwise

    ReplyDelete
  13. Unknown18 April 2018 at 22:43

    Good

    ReplyDelete
  14. Shyam paikara14 October 2018 at 23:04

    bad contents

    ReplyDelete
  15. Shyam paikara14 October 2018 at 23:10

    This comment has been removed by the author.

    ReplyDelete
  16. Shyam paikara14 October 2018 at 23:13

    please download my official application ""medicaps university"" where you get all information.

    ReplyDelete
  17. Shyam paikara14 October 2018 at 23:37

    This comment has been removed by the author.

    ReplyDelete
  18. Unknown14 February 2020 at 01:42

    For which of the following instructions are 9-bits involved in the rotation?

    ReplyDelete
  19. Unknown1 June 2020 at 20:37

    The discussion about the accumulator here is very useful. Even though it is not the main topic but the information and ideas presented are very useful.

    ReplyDelete