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68HC12 Arithmetic

68HC12 Arithmetic. Chapter 3. 68HC12 Arithmetic. Addition and Subtraction Double Numbers Multiplication Division Shift and Rotate Instructions. Addition and Subtraction. 68HC12 code for 1+, 2+ . ; 1+ ( n -- n+1 ) ONEP LDD 0,X ADDD #1 STD 0,X RTS ; 2+ ( n -- n+2 ) TWOP

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68HC12 Arithmetic

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  1. 68HC12 Arithmetic Chapter 3

  2. 68HC12 Arithmetic • Addition and Subtraction • Double Numbers • Multiplication • Division • Shift and Rotate Instructions

  3. Addition and Subtraction

  4. 68HC12 code for 1+, 2+ ; 1+ ( n -- n+1 ) ONEP LDD 0,X ADDD #1 STD 0,X RTS ; 2+ ( n -- n+2 ) TWOP LDD 0,X ADDD #2 STD 0,X RTS

  5. 68HC12 code for 1-, 2- ; 1- ( n -- n-1 ) ONEP LDD 0,X SUBD #1 STD 0,X RTS ; 2- ( n -- n-2 ) TWOP LDD 0,X SUBD #2 STD 0,X RTS

  6. 68HC12 Arithmetic • Addition and Subtraction • Double Numbers • Multiplication • Division • Shift and Rotate Instructions

  7. Double Numbers

  8. Adding Double Numbers

  9. Subtracting Double Numbers

  10. 68HC12 Arithmetic • Addition and Subtraction • Double Numbers • Multiplication • Division • Shift and Rotate Instructions

  11. Multiplication

  12. Multiplication

  13. Multiplication

  14. 68HC11: A, B, C, D are 8 bits 16 x 16 => 32-bit product 68HC12: A, B, C, D could be 16 bits 32 x 32 => 64-bit product

  15. Multiplication - DUM*

  16. WHYP Multiplication Examples

  17. 68HC12 Arithmetic • Addition and Subtraction • Double Numbers • Multiplication • Division • Shift and Rotate Instructions

  18. Division

  19. WHYP uses symetric (not floored) division

  20. Examples of using / and MOD

  21. Examples of using UM/MOD

  22. MU/MOD

  23. Examples of using MU/MOD

  24. M/MOD

  25. Examples of using M/MOD

  26. */

  27. Examples of using */

  28. IDIV

  29. U/

  30. Examples of using IDIV and U/

  31. FDIV

  32. Examples of using FDIV

  33. 68HC11 version of UM/MOD

  34. 68HC12 Arithmetic • Addition and Subtraction • Double Numbers • Multiplication • Division • Shift and Rotate Instructions

  35. C Bit 7 6 5 4 3 2 1 0 1 1 0 1 0 0 1 0 1 Logic Shift LeftLSL, LSLA, LSLB 0 C Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 1 1 0 1 0 0 1 0 1 0 1 0 1 0 0 1 0 1 A B LSLD

  36. Logic Shift RightLSR, LSRA, LSRB C Bit 7 6 5 4 3 2 1 0 0 1 0 1 0 0 1 0 1 1 C Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 A B LSRD

  37. Arithmetic Shift RightASR, ASRA, ASRB C 1 0 1 0 0 1 0 1 1

  38. Rotate LeftROL, ROLA, ROLB C Bit 7 6 5 4 3 2 1 0 1 1 0 1 0 0 1 0 1

  39. Rotate RightROR, RORA, RORB C Bit 7 6 5 4 3 2 1 0 1 0 1 0 0 1 0 1 1

  40. 2*, 2/, and U2/

  41. LSHIFT and RSHIFT

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