The following instruction sequence, CPL P1.1. CPL P1.2. leaves the port set to 5BH (01011011B). Bytes: Number of bytes required to encode the instruction. Cycles: Number of instruction cycles required to execute the instruction. Note that there are 12 oscillator cycles to one instruction cycle on a standard 8051. 8051 Instruction hex code MOVE with immediate data Hex Bytes Instruction 74 2 MOV A, #immediate 75 3 MOV direct, #immediate 76 2 MOV @R0, #immediate 63 3 XRL direct, #immediate 64 2 XRL A, #immediate 65 2 XRL A, direct 66 1 XRL A, @R0 67 1 XRL A, @R1 68 1 XRL A, R0 69 1 XRL A, R1 6A 1 XRL A, R2 The ANL instruction performs a bitwise logical AND operation between the specified byte or bit operands and stores the result in the destination operand. Note When this instruction is used to modify an output port, the value used as the port data will be read from the output data latch, not the input pins of the port. See Also: ORL, XRL In 8051 there are different ways in which you can address or use these instructions. These are called addressing modes. Immediate addressing mode In this addressing mode, the data is specified in the instruction itself. The # symbol specifies the value being data. E.g. MOV A, #35H (Value 35 is moved in Accumulator). The Arithmetic Instructions in 8051 of Basic Assembly Language Programming are. ADD, ADDC, SUBB and DA. The ADD instruction adds a byte variable with the accumulator, leaving the result in the accumulator: The carry flag is set if there is an overflow from bit 7 and cleared otherwise. The AC flag is set to the carry-out from bit 3 for use by THE 8051 INSTRUCTION SET All commands in alphabetic order: ACALL addr11 DIV AB LJMP addr16 RETI ADD A,