I am looking for the general idea of what each instruction does. I just want a g

Question

I am looking for the general idea of what each instruction does. I just want a general understanding of how the other steps work when jump and compare are involved. It would also be helpful to see how this would look as a function in C.

I'm trying to learn more about assembly code and so far I've only understood about half of what I've read. I understand that the first few instructions set up the stack frame and pointers as well as return and leave but as it progresses it starts to get more confusing.

This is the understanding I have so far.

Explanation / Answer

CALL - Absolute Call ADD, ADDC - Add Accumulator (With Carry) AJMP - Absolute Jump ANL - Bitwise AND CJNE - Compare and Jump if Not Equal CLR - Clear Register CPL - Complement Register DA - Decimal Adjust DEC - Decrement Register DIV - Divide Accumulator by B DJNZ - Decrement Register and Jump if Not Zero INC - Increment Register JB - Jump if Bit Set JBC - Jump if Bit Set and Clear Bit JC - Jump if Carry Set JMP - Jump to Address JNB - Jump if Bit Not Set JNC - Jump if Carry Not Set JNZ - Jump if Accumulator Not Zero JZ - Jump if Accumulator Zero LCALL - Long Call LJMP - Long Jump MOV - Move Memory MOVC - Move Code Memory MOVX - Move Extended Memory MUL - Multiply Accumulator by B NOP - No Operation ORL - Bitwise OR POP - Pop Value From Stack PUSH - Push Value Onto Stack RET - Return From Subroutine RETI - Return From Interrupt RL - Rotate Accumulator Left RLC - Rotate Accumulator Left Through Carry RR - Rotate Accumulator Right RRC - Rotate Accumulator Right Through Carry SETB - Set Bit SJMP - Short Jump SUBB - Subtract From Accumulator With Borrow SWAP - Swap Accumulator Nibbles XCH - Exchange Bytes XCHD - Exchange Digits XRL - Bitwise Exclusive OR Undefined - Undefined Instruction

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