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Module 3: Instruction Set and Programming

20257m

Discuss the data transfer and arithmetic instructions of the 8051.

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Data Transfer & Arithmetic Instructions – 8051

Data Transfer:

  • MOV A,#55H, MOV A,30H, MOV A,@R0, MOV DPTR,#1234H, MOVC A,@A+DPTR, MOVX A,@DPTR, PUSH ACC, POP B, XCH A,R0, XCHD A,@R0
    Groups: Immediate, direct, indirect, DPTR.

Arithmetic:

  • ADD A,R0 A←A+R0 (flags CY,AC,OV,P)
  • ADDC A,R1 with carry
  • SUBB A,R2 A←A - R2 - CY
  • INC A, DEC R0, INC DPTR
  • MUL AB B:A←A×B (OV if >255), 4 cycles
  • DIV AB A←A/B, B←remainder
  • DA A decimal adjust after ADD
    Examples illustrate covering all categories.

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