1 / 19

Microcontroller Fundamentals & Programming

Microcontroller Fundamentals & Programming. Data Movement Instructions. Data Movement Instructions. LOAD Instructions e.g. LDAA , LDAB , LDD , LDX , LDY STORE Instructions e.g. STAA , STAB , STD , STX , STY TRANSFER Instructions and e.g. TAB , TBA EXCHANGE Instructions

denali
Télécharger la présentation

Microcontroller Fundamentals & Programming

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Microcontroller Fundamentals & Programming Data Movement Instructions

  2. Data Movement Instructions • LOAD Instructions e.g. LDAA , LDAB , LDD , LDX , LDY • STORE Instructions e.g. STAA , STAB , STD , STX , STY • TRANSFER Instructions and e.g. TAB , TBA • EXCHANGE Instructions e.g. XGDX , XGDY

  3. 22 33 44 I/O LOAD Instructions Load Instructions : Example: LDAA , LDAB , LDD , LDX , LDY Instructions load CPU registers with values from memory or I/O. 68HC11 Memory CPU Registers Data Flows

  4. Sample of Load Instructions (1) Addressing Instructions Modes Description LDAA #$30 IMM ;ACCA loaded with $30 (hex) CPU ACCA I/O $30 Data Flows

  5. $22 $33 $44 $002E $002F $0030 Sample of Load Instructions (2) Addressing Instructions Modes Description LDAA $30 DIR ;ACCA loaded with contents ;from memory address $30 Memory Content Memory Address CPU ACCA $44 Data Flows

  6. $56 $78 $90 $9000 $9001 $9002 Sample of Load Instructions (3) Addressing Instructions Modes Description LDD $9000 EXT ;ACCD loaded with contents ;from memory address $9000 ;& $9001 Memory Content Memory Address CPU ACCA ACCB $56 $78 $44 ACCD

  7. $22 $33 $44 $902E $902F $9030 Sample of Load Instructions (4) Addressing Instructions Modes Description LDAA $10,X IND ;ACCA loaded with contents ;from memory address (offset ;+ X) Memory Content Memory Address CPU IND X 9020 ACCA $44 Data Flows

  8. STORE Instructions Store Instructions : Example: STAA , STAB , STD , STX , STY - Instructions store or place contents of any CPU registers to a memory or I/O location. 68HC11 Memory CPU Registers I/O Data Flows

  9. $22 $33 $44 $000F $0010 $0011 Sample of Store Instructions (1) Addressing Instructions Modes Description STAA $10 DIR ; Place contents of ACCA into ; memory location ($0010). Memory Content Memory Address CPU ACCA $90 $90 $44 Data Flows

  10. $22 $33 $44 $0FFF $1000 $1001 Sample of Store Instructions (2) Addressing Instructions Modes Description STAA $1000 EXT ; Place contents of ACCA into ; memory location ($1000). Memory Content Memory Address CPU ACCA $E0 $E0 $44 Data Flows

  11. $22 $33 $44 $005F $0060 $0061 Sample of Store Instructions (3) Addressing Instructions Modes Description STX $60 DIR ; Place contents of IX into ; memory location $0060 and ; $0061 Memory Content Memory Address CPU IX Register $12 $34 $1234 $44 Data Flows

  12. $22 $33 $44 $801E $801F $8020 Sample of Store Instructions (4) Addressing Instructions Modes Description STAA $20,Y IND ; Place contents of ACCA into ; memory location $20 + Y CPU Memory Content Memory Address IY $8000 $44 $E0 $E0 Data Flows ACCA

  13. TRANSFER Instructions 68HC11 • Transfer Instructions: • Example: TAB , TBA • TAB => Transfer ACCA to ACCB. • Instruction TAB will move (or copy) the contents of ACCA to ACCB. • If contents ACCA = $38 & ACCB = $9F • Executing TAB, will result in ACCA = ACCB = $38 TBA ACCA ACCB TAB

  14. $42 $8E TRANSFER Instructions Example: TBA = Transfer (or copy) contents of ACCB to ACCA. If contents of ACCA = $42 & ACCB = $8E 68HC11 TBA $8E ACCB ACCA

  15. EXCHANGE Instructions 68HC11 • Exchange Instructions • Examples: XGDX , XGDY • XGDX instruction will transfer the contents of ACCD to Index-X (IX) register and the contents of IX will transfer to ACCD. ACCD IX

  16. EXCHANGE Instructions Example: XGDY :Instruction will transfer the contents of ACCD to Index-Y (IY) register and the contents of IY will transfer to ACCD. 68HC11 XGDY $1234 $5678 ACCD IY

  17. Load, Transfer and Exchange Instructions Examples: LDAA #$59 LDAB #$2A TAB LDX #$4567 XGDX LDY #$1122 XGDY ; Load ACCA with data $59 ; Load ACCB with data $2A ; Transfer contents of ACCA to ACCB ; Load IX register with data $4567 ; Exchange contents of IX and ACCD ; Load IY with data $1122 ; Exchange contents of IY and ACCD

  18. Load, Transfer and Exchange Instructions Examples: LDAA #$59 LDAB #$2A TAB LDX #$4567 XGDX LDY #$1122 XGDY A B A, B $2A $59 $11 $67 $22 $59 $45 D $4567 $1122 $5959 $592A IX $5959 $4567 IY $1122 $4567

  19. Thank You

More Related