BOOLEAN INSTRUCTIONS OF 8051/8031 MICROCONTROLLER

•    The Boolean variable instructions operate on a particular bit of a data.

•    These instructions perform clear, complement or move a particular bit of bit addressable RAM/SFR or carry flag.

•    If a particular bit is set or cleared then this instruction will transfer the PC address to new address.

•    The Boolean instructions are CLR, SETB, CPL, ANL, ORL, MOV, JC and JNC.



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BRANCHING INSTRUCTIONS FOR 8051/8031 MICROCONTROLLER

•    The branching instructions will modify the content of PC so that the program execution sequence is changed to new address.

•    There are two types of branching instructions like condition and unconditional instructions.

•    In conditional branching the content of PC is changed only if the condition specified is true.

•    In unconditional branching the PC is always modified.

•    The program branching instructions are ACALL, LCALL, RET, AJMP, LJMP, SJMP, JMP, JZ, JNZ, CJNE, DJNZ and NOP.


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LOGICAL INSTRUCTIONS FOR 8051/8031 MICROCONTROLLER

•    The logical instructions are used to perform logical AND, OR, Exclusive-OR, Complement and rotate left and right.

•    The various mnemonics used for logical instructions are ANL, ORL, XRL, CLR, CPL, RL, RLC, RR and RRC AND SWAP.

•    Only the rotate through the carry instruction will affect the flag.

•    In most of the result of logical instruction is stored in accumulator and in some instructions the result is stored in RAM/SFR.


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ARITHMETIC INSTRUCTIONS IN 8051/8031 MICROCONTROLLER


•    The arithmetic instructions are used to performing addition, subtraction, multiplication, division, and increment and decrement operation on binary data.

•    The mnemonic used in arithmetic instructions are ADD, ADDC, SUBB, INC, DEC, MUL, DIV and DA.

•    The result of most of the arithmetic operation is stored in accumulator except a few decrement and increment operations.

•    The arithmetic instructions except increment and decrement instructions modify the flags of 8031/8051

 



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DATA TRANSFER INSTRUCTIONS IN 8051/8031 MICROCONTROLLER

Data transfer between registers and memory locations are done by data transfer instructions.
The various mnemonics used for data transfer instructions are MOV, MOVC, MOVX, PUSH, POP, XCH and XCHD, and they perform any one of the following operations.

•    Copy the content of a SFR to internal memory or vice-versa.

•    Load an immediate operand to SFR/internal memory.

•    Exchange the content of SFR internal memory with accumulator.

•    Copy the content of program memory to accumulator.

•    Copy the content of data memory to accumulator or vice-versa.


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INSTRUCTION SET - ASSEMBLY LANGUAGE PROGRAMMING FOR 8051/8031 MICROCONTROLLER

The 8031/8051 instructions can be classified into the following five groups.


3.Logical instructions

4.Branching instructions

5.Boolean instructions
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