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Ernest Kazakov
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Data Transfer Instructions Of 8051 Ppt VERIFIED



In 8051 Microcontroller there is 28 different instructions under the Data Transfer Group. In total there are 79 opcodes. The flags are not affected by using the data transfer instructions, but the P (Parity) flag may change if the value of A register is changed using Data Transfer Instruction. Similarly, when a data is transferred to the PSW register, the flags will change.




Data Transfer Instructions Of 8051 Ppt


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By signing up, you are agreeing to our terms of use. Read the privacy policy for more information.var login_area=document.getElementById('login-area');var sign_in_btn=document.getElementById("sign-in-btn");var page_mask_dark=document.getElementById("page-mask-dark");var close_span=document.getElementsByClassName("close-btn")[0];sign_in_btn.onclick=function()login_area.style.display="block";page_mask_dark.style.display="block";close_span.onclick=function()login_area.style.display="none";page_mask_dark.style.display="none";page_mask_dark.onclick=function()login_area.style.display="none";page_mask_dark.style.display="none";View Course PathData Transfer instructions in 8051Nischay Khanna Published April 24, 2020 Updated May 9, 2020if(typeof ez_ad_units!='undefined')ez_ad_units.push([[728,90],'technobyte_org-box-3','ezslot_5',105,'0','0']);__ez_fad_position('div-gpt-ad-technobyte_org-box-3-0');Any instruction given to the microcontroller contains two parts: an opcode and an operand. The opcode is responsible for telling the microcontroller what to do, whereas the operand holds the data on which the operations are to be performed. The 8051 microcontroller has an 8-bit opcode which gives it the ability to handle 2^8(255) instructions. The operands, on the other hand, can be of 0 bytes, 1 byte or 2 bytes. In this article, we will be talking about the data transfer instructions in 8051 that are a subset of the instructions it offers. These instructions are responsible for moving data from one place to another in the microcontroller.But before we go on talking about those data transfer instructions. I would like to discuss what happens when a microcontroller starts and how it performs all those complex operations in just a matter of milliseconds.if(typeof ez_ad_units!='undefined')ez_ad_units.push([[300,250],'technobyte_org-medrectangle-3','ezslot_4',106,'0','0']);__ez_fad_position('div-gpt-ad-technobyte_org-medrectangle-3-0');So when the microcontroller turns on the program counter holds the starting address (0000H). The programmer can change this starting address, but if no changes are made, then the microcontroller puts this address on the address bus. The address bus locates the memory location on the ROM and gets the instruction.Then the microcontroller increments the program counter according to the size of the instruction. Once the instruction is retrieved, it is placed in the instruction register. Afterward, the instruction decoder decodes the instruction, and the control unit generates the control signals accordingly. Now that you are familiar with the working of the 8051 let us get to understanding its data transfer instructions it offersif(typeof ez_ad_units!='undefined')ez_ad_units.push([[970,250],'technobyte_org-box-4','ezslot_7',107,'0','0']);__ez_fad_position('div-gpt-ad-technobyte_org-box-4-0');Contents


OpcodeOperandDescriptionSizeExecution timeFlags affectedXCHA,RnExchanges the value between a register and the accumulator1 byte12 Clock cyclesNoneA,AddressExchanges the value between the accumulator and a memory location in the RAM2 bytes12 Clock cyclesNoneA,@RnExchanges the value between the accumulator and a memory location stored in the register1 byte12 Clock cyclesNoneXCHDA,@RnExchanges the lower four bits of a memory location stored in a register with the accumulator1 byte12 Clock cyclesNoneWe hope that reading this article has helped you to understand the data transfer instructions in the 8051 microcontroller. If you have any doubts feel free to ask them in the comments section below.


Moving data around is an elementary function of any processing unit. Here are all the instructions that we use to move data in the 8051 microcontroller. Pay special attention to the flags section, you might notice a pattern that would need remembering.


An Engineering Graduate with a specialization in Embedded systems, who loves to dabble with IoT automation cause switching lights on with switches is to mainstream. A bibliophile who loves to travel and experience new cultures.Related courses to Data Transfer instructions in 8051


As the 8051 family of Microcontrollers are 8-bit processors, the 8051 Microcontroller Instruction Set is optimized for 8-bit control applications. As a typical 8-bit processor, the 8051 Microcontroller instructions have 8-bit Opcodes. As a result, the 8051 Microcontroller instruction set can have up to 28 = 256 Instructions.


Before going into the details of the 8051 Microcontroller Instruction Set, Types of Instructions and the Addressing Mode, let us take a brief look at the instructions and the instruction groups of the 8051 Microcontroller Instruction Set (the MCS-51 Instruction Set).


The arithmetic instructions have no knowledge about the data format i.e., signed, unsigned, ASCII, BCD, etc. Also, the operations performed by the arithmetic instructions affect flags like carry, overflow, zero, etc. in the PSW Register.


The next group of instructions are the Logical Instructions, which perform logical operations like AND, OR, XOR, NOT, Rotate, Clear and Swap. Logical Instruction are performed on Bytes of data on a bit-by-bit basis.


The last group of instructions in the 8051 Microcontroller Instruction Set are the Program Branching Instructions. These instructions control the flow of program logic. The mnemonics of the Program Branching Instructions are as follows.


All these instructions, except the NOP (No Operation) affect the Program Counter (PC) in one way or other. Some of these instructions has decision making capability before transferring control to other part of the program.


In this tutorial, we have seen the introduction to the 8051 Microcontroller Instruction Set, Addressing Modes in 8051 Microcontroller and different types of instructions in the Instruction Set of the 8051 Microcontroller.


Data Manipulation Instructions :Data manipulation instructions perform operations on data and provide the computational capabilities for the computer. The data manipulation instructions in a typical computer usually divided into three basic types as follows.


Registers are usually known as data storage devices. 8051 microcontroller has 2 registers, namely Register A and Register B. Register A serves as an accumulator while Register B functions as a general purpose register. These registers are used to store the output of mathematical and logical instructions.The operations of addition, subtraction, multiplication and division are carried out by Register A. Register B is usually unused and comes into picture only when multiplication and division functions are carried out by Register A. Register A also involved in data transfers between the microcontroller and external memory.8051 microcontroller also has 7 Special Function Registers (SFRs). They are:1. Serial Port Data Buffer (SBUF)2. Timer/Counter Control (TCON)3. Timer/Counter Mode Control (TMOD)4. Serial Port Control (SCON)5. Power Control (PCON)6. Interrupt Priority (IP)7. Interrupt Enable Control (IE)4. Timers and Counters


A code of 4K memory is incorporated as on-chip ROM in 8051. The 8051 ROM is a non-volatile memory meaning that its contents cannot be altered and hence has a similar range of data and program memory, i.e, they can address program memory as well as a 64K separate block of data memory.


The 8051 microcontroller has four 8-bit input/output ports. These are:PORT P0: When there is no external memory present, this port acts as a general purpose input/output port. In the presence of external memory, it functions as a multiplexed address and data bus. It performs a dual role.


The stack pointer (SP) in 8051 is an 8-bit register. The main purpose of SP is to access the stack. As it has 8-bits it can take values in the range 00 H to FF H. Stack is a special area of data in memory. The SP acts as a pointer for an address that points to the top of the stack.12. Data and Address Bus


A bus is group of wires using which data transfer takes place from one location to another within a system. Buses reduce the number of paths or cables needed to set up connection between components.There are mainly two kinds of buses - Data Bus and Address BusData Bus: The purpose of data bus is to transfer data. It acts as an electronic channel using which data travels. Wider the width of the bus, greater will be the transmission of data.Address Bus: The purpose of address bus is to transfer information but not data. The information tells from where within the components, the data should be sent to or received from. The capacity or memory of the address bus depends on the number of wires that transmit a single address bit.


This page covers 8051 instruction set. The 8051 instructions are specified with opcode, operand, size in bytes, M-cycle (number of machine cycles) etc.Here one machine cycle consists of 12 oscillator periods.


SD card has a native host interface apart from the SPI mode for communicating with master devices. The native interface uses four lines for data transfer where the microcontroller has SD card controller module and it needs separate license to use it. Since the SPI is a widely used protocol and it is available in most low-cost microcontrollers, the SPI mode is the widely used interface in low cost embedded systems. The working voltage range of SD family is 2.7V to 3.6V and this is indicated in the operation condition register (OCR).


8051 Instruction Set: Addressing Modes, Data Transfer instructions, Arithmetic instructions, Logical instructions, Branch instructions, Bit manipulation instructions. Simple Assembly language program examples (without loops) to use this instruction 041b061a72


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