What is DPTR assembly language?

The Data Pointer (DPTR) is the 8051’s only user-accessible 16-bit (2-byte) register. The Accumulator, R0–R7 registers and B register are 1-byte value registers. DPTR is meant for pointing to data. It is used by the 8051 to access external memory using the address indicated by DPTR.

What is instruction set in assembly language?

An instruction set is code that a CPU can understand. Instruction sets are part of ISA (Instruction Set Architecture). You can write code in assembly language, which is then assembled into machine language (the 1s and 0s the processor understands).

What is the instruction set of 8051?

A Brief Look at 8051 Microcontroller Instructions and Groups


What is DJNZ instruction?

The DJNZ instruction decrements the byte indicated by the first operand and, if the resulting value is not zero, branches to the address specified in the second operand.

What is the difference between Movx and MOV?

The MOV Instruction Most basic operation: copying data from one place to another. The MOVX Instruction This instruction is used to transfer data between external RAM and internal register A.

What is 8051 assembly language?

The assembly language is a low-level programming language used to write program code in terms of mnemonics. It is also used to write the 8051 programming code efficiently with less number of clock cycles by consuming less memory compared to the other high-level languages.

What is the example of instruction?

The definition of instruction is the act of educating, giving the steps that must be followed or an order. An example of instruction is someone giving another person detailed directions to the library.

Are push and pop instructions are a type of call instruction?

PUSH and POP instructions are not CALL instructions because in POP and PUSH instructions the pointer does not move to any location specified by its address which is the fundamental of CALL instruction, so it is not a type of CALL instruction.

Which type of instruction is DJNZ?

An instruction DJNZ reg, label is used to perform a Loop operation. In this instruction, a register is decremented by 1; if it is not zero, then 8051 jumps to the target address referred to by the label. The register is loaded with the counter for the number of repetitions prior to the start of the loop.

Is there an instruction set manual for 8051?

The 8051 Instruction Set Manual explains the standard 8051 instructions. The 8051 Instruction Set is supported by the Keil Ax51 Macro Assembler and the in-line Assembler of the Keil Cx51 Compiler. This manual contains the following chapters: Architecture Overview describes the memory layout and CPU registers of several 8051 variants.

Which is an example of an assembly language instruction?

The essence of assembly language is that for each machine code instruction there is an equivalent assembly language instruction which comprises: a mnemonic (a symbolic abbreviation) for the opcode a character representation for the operand.

What are the instructions in the 8086 instruction set?

Following is the list of instructions under this group − ADD − Used to add the provided byte to byte/word to word. ADC − Used to add with carry. INC − Used to increment the provided byte/word by 1. AAA − Used to adjust ASCII after addition.

What is the Atmel 8051 microcontroller instruction set?

Section 1 8051 Microcontroller Instruction Set Atmel 8051 Microcontrollers Hardware 1 0509C–8051–07/06 Section 1 8051 Microcontroller Instruction Set For interrupt response time information, refer to the hardware description chapter. Note: 1.