Instructions, OpCode, Bytes, Flags. ACALL page0, 0x11, 2, None. ACALL page1, 0x31, 2, None. ACALL page2, 0x51, 2, None. ACALL page3, 0x71, 2, None. Home > Architecture Overview > Opcodes. Opcodes. The following table lists the instructions by HEX code. Hex Code, Bytes, Mnemonic, Operands. Instruction Set Summary. Rn. Register R7-R0 of the currently selected Register Bank. Data. 8-bit internal data location’s address. This could be an internal.

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Discussion in ‘ General Electronics Chat ‘ started by veadNov 19, Nov 19, 1.

instruction set-opcode,operand,size in bytes,M-cycle

Nov 24, Last formmetI opcoees it use Instruction decoder? Q3 If possble anyone please explain how the diifferent instruction execute in different formmet. Nov 19, 2.

Dec 13, 2, Nov 19, 3.

Apr 9, The has opcodes, the A5 opcode is not used and listed as “reserved”. Over the years there has been much speculation about what the “secret” A5 opcode does. 8015 21, 4. Processor read Byte from Program memory at the address indicate by program counter Example: It knows that it needs to add the contents of the specified register into the accumulator, and it uses the ALU to do this.


ALU also use pse register oppcodes carry auxillary carry overflow … Then the program counter is incremented to Memory address opcode operand. Nov 21, 5. Nov 21, 6. Nov 21, 7. Apr 28, 3, The problems here are on the C language level- how it translates into machine instructions is not interesting.

8051 Instruction set

You’d get old if you dig into the disassembly. You are either a genius for binary and internal works of a CPU, and can guess most things, or you arent, in which case I’d recommend just to treat the CPU as black box, and deal with C language problems instead.

Try a BMP decoder first, perhaps.

Nov 21, 8. Nov 21, 9. Nov 21, Intel has multibyte instructions, simply put.

Certain opcodes opcoves the CPU in a state where it will expect another byte. Is that so difficult to find out yourself? If so, maybe its the wrong job you are trying to learn.

Instruction Set

It wont get better, it will get opodes, as certainly, not all is explained in a way all is included and totally clear. Looking for instance at touch button source codes for STM8, with your approach of researching, asking and reasoning, not even “good luck” could be expressed, rather “dont touch it at all”.


I mean, you wont get anywhere if you cant put opfodes together yourself. Not to speak, you wont be a brilliant hardware crackwhiz neither, inventing something new. Or probably you will, because you question things which by now, should be quite obvious to you already?

8051 Opcodes

Maybe some day this will allow you to see them in a way we dont, make some clever deduction, and win a nobel prize. Jan 17, 5, 6, I think I’m beginning to understand what your question here is Sep 20, 5, Nov 22, Determine opcode of instruction Posted by antiantianti in forum: Embedded Systems and Microcontrollers. Instruction set Posted by vead in forum: Instruction set need advice?

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