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The CPU12 Microprocessor Core

The CPU12 Microprocessor Core. Lecture L2.1. Reference. S12CPUV2 Reference Manual S12CPUV2.pdf (in .zip file). Print out Appendix A – Instruction Reference It will answer all questions concerning HCS12 instructions and addressing modes. Introducing the CPU12. The CPU12 Registers

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The CPU12 Microprocessor Core

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  1. The CPU12 Microprocessor Core Lecture L2.1

  2. Reference S12CPUV2 Reference Manual S12CPUV2.pdf (in .zip file) Print out Appendix A – Instruction Reference It will answer all questions concerning HCS12 instructions and addressing modes

  3. Introducing the CPU12 • The CPU12 Registers • CPU12 Addressing Modes • CPU12 Instructions

  4. The 68HC12 Registers

  5. Condition Code Register

  6. A c c u m u l a t o r A A c c u m u l a t o r B A B A c c u m u l a t o r D D The 68HC12 Accumulators

  7. I n d e x r e g i s t e r X X I n d e x r e g i s t e r Y Y Index Registers, X and Y

  8. S t a c k P o i n t e r S P Stack Pointer, SP

  9. Introducing the CPU12 • The CPU12 Registers • CPU12 Addressing Modes • CPU12 Instructions

  10. Pre-decrement indexed addressing

  11. Using X as a stack pointerfor a data stack LDY 2,X+will pop $1234 into Y

  12. MOVW 0,X,2,-X

  13. LDD 0,XMOVW 2,X,0,XSTD 2,X

  14. MOVW 2,X,2,-X

  15. Introducing the CPU12 • The CPU12 Registers • CPU12 Addressing Modes • CPU12 Instructions

  16. Load Accumulator A 1: ; LDAA Addressing Modes 2: =00004000 ORG $4000 3: 4000 86 35 LDAA #$35 4: 4002 96 A3 LDAA $A3 5: 4004 B6 5678 LDAA $5678 6: 4007 A6 03 LDAA 3,X 7: 4009 A6 E9 38 LDAA -200,Y 8: 400C A6 F2 1234 LDAA $1234,SP 9: 4010 A6 E7 LDAA [D,X] 10: 4012 A6 EB 2345 LDAA [$2345,Y]

  17. 1: ; LDAA Addressing Modes 2: =00004000 ORG $4000 3: 4000 86 35 LDAA #$35 4: 4002 96 A3 LDAA $A3 5: 4004 B6 5678 LDAA $5678 6: 4007 A6 03 LDAA 3,X 7: 4009 A6 E9 38 LDAA -200,Y 8: 400C A6 F2 1234 LDAA $1234,SP 9: 4010 A6 E7 LDAA [D,X] 10: 4012 A6 EB 2345 LDAA [$2345,Y] 200 = $C8 = 11001000 9-bit = 011001000 2’s comp = 100111000 = $138 11101001 = $E9

  18. 1: ; LDAA Addressing Modes 2: =00004000 ORG $4000 3: 4000 86 35 LDAA #$35 4: 4002 96 A3 LDAA $A3 5: 4004 B6 5678 LDAA $5678 6: 4007 A6 03 LDAA 3,X 7: 4009 A6 E9 38 LDAA -200,Y 8: 400C A6 F2 1234 LDAA $1234,SP 9: 4010 A6 E7 LDAA [D,X] 10: 4012 A6 EB 2345 LDAA [$2345,Y] 11110010 = $F2

  19. 1: ; LDAA Addressing Modes 2: =00004000 ORG $4000 3: 4000 86 35 LDAA #$35 4: 4002 96 A3 LDAA $A3 5: 4004 B6 5678 LDAA $5678 6: 4007 A6 03 LDAA 3,X 7: 4009 A6 E9 38 LDAA -200,Y 8: 400C A6 F2 1234 LDAA $1234,SP 9: 4010 A6 E7 LDAA [D,X] 10: 4012 A6 EB 2345 LDAA [$2345,Y] 11100111 = $E7

  20. 1: ; LDAA Addressing Modes 2: =00004000 ORG $4000 3: 4000 86 35 LDAA #$35 4: 4002 96 A3 LDAA $A3 5: 4004 B6 5678 LDAA $5678 6: 4007 A6 03 LDAA 3,X 7: 4009 A6 E9 38 LDAA -200,Y 8: 400C A6 F2 1234 LDAA $1234,SP 9: 4010 A6 E7 LDAA [D,X] 10: 4012 A6 EB 2345 LDAA [$2345,Y] 11101011 = $EB

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