8051 for loop delay

Generating one second delay using Internal timer registers of 8051(89c51 Loops are only suitable if you want an arbitrary delay in your program and not a  SECTION 3. AVR Delay Loop Calculator. These will add an essentially random amount of time to each delay function call depending upon the frequency and processing requirements of each interrupt. Time delay generation in 8051 architecture is done by the two methods. In most cases there are macros available that’ll do the calculations for you and will make the correct loop to delay the precise time. And as we want our LED to blink forever, we have used this loop. Timer frequency is always 1/12th of the frequency of the crystal attached to the 8051. assembler In the 8051, the loop action is performed by the instruction “DJNZ Rn, LABEL”. cycles go. We have created delay of 50us through the function “servo_delay”, and used “for” loop to create delay in multiple of 50us. Timers T0 and T1 completely fall under the 8051 Standard. The 8051 microcontroller 8 The “super loop” software architecture 9 Generating a precise 50 ms delay 122 RS-232 and 8051: Overall strengths and weaknesses I hope you have understand how to interface DS3231 RTC with 8051 using I2C. All the ports of 8051 can be used for Input or Output. The 8051 microcontroller has two independent 16 bit up counting timers named Timer 0 and Timer 1 and this article is about generating time delays using the 8051 timers. Skip navigation Sign in. Sorry for stealing your valuable time. In this project, I will discuss a little bit about Timers in 8051 Microcontroller and also how to Generate a Delay using 8051 Timers. that will give you the time delay. By default, the routine is coded so that the absolute delay time (in microseconds) is divided by eight, which is used as the number of times that the proc essor loops to achieve the specified delay. ~: Sample Programs in Keil for 8051:~ example-1: generate a square wave of 100 Hz at pin P1. In this tutorial, we will learn how to do programming on an 8051 microcontroller in a stepwise manner? First, we will learn how to setup the Keil uvision IDE, then we will move on how to compile a simple C program and finally generating hex code to burn in the microcontroller? Led blinking program with 8051 Microcontroller and Keil uVision4 The first “Hello World!” project I prefer for Microcontroller is LED Blinking. Still, this simplistic example does use several of the basic inline assembly features. MODE 1 (Example) 16-bit Timer 0: and the time it takes the processor to execute a single loop. Delay generation using NOP of 8051. Atmel 8051 microcontroller needs Keil software for its programming. The 8051 Simulator for Lecturers and Students. Prior to the start of the loop the register is loaded with the counter for the number of repetitions. . Please guide me to generate a delay loop in c51. While ultrasonic sensor keeps scanning its stuck in a while function but at the same time I want to keep my infinite loop running for other functions. 5V battery or a digital watch running with lithium or silver oxide. Each time it goes through the main loop . Examples. This condition always holds true so this loop is never ending loop. time delay in 8051 c. The DELAY subroutine has 3 instructions in which MOV needs 1 machine cycle to execute and DJNZ and RET needs 2 machine cycles Total number of machine cycle required is 1 + 200*2 + 2 = 403 Total time taken by DELAY sub routine is 403 * 1. If we found that these delays were not long enough, we could easily extend them by adding additional layers, as shown in Longer_Loop_Delay() 8051 Microcontroller based electronic locker system. Timer0 is used here to generate the exact delay required. Because  8051-CH3-950217 - Free download as Powerpoint Presentation (. This should be connected to Vcc when we are not using the any external memory. This page will show you how to utilize these timers in your code. delay subroutine Discussion in "8051 for an instruction to execute and then multiply it by the loop count. While loop is running for 500 times and generates 1 second delay. In a 100 MHz single clock per cycle 8051, you can't fit Delay function: This will give some delay. Loop method does come handy for display programming. Top. Say in the below example the 5ms program is executed repetitively for 200 times so that the one second delay is achieved. LOOP: DJNZ R0, LOOP ;DJNZ instruction executed 10 times MOV A, R1 • The DJNZ instruction takes 2 machine cycles to execute (24 clocks) • If the 8051 is operating from a 12MHz crystal, the loop execution time is (10 * 24)/12000000 = 20usec • The maximum delay for a single loop occurs when the loop counter is initialised to 0 I am trying to get delay of one second using nested loops in 8051 assembly, use of timer will simplify this but it is required to do it this way! Is this calculation OK ? In implementation it is taking around 10 seconds instead of one second. 3: TIME DELAY FOR VARIOUS 8051 CHIPS In the last section we used Most of the time delay is performed by the body of the loop, as shown in  For an 8051 microcomputer a single instruction cycle is executed for every 12 clock In the ONE_MILLI_SUB subroutine a tight loop is executed 250 times. 059MHz. Most of the times, we need to generate precise time delay be In this assembly tutorial we cover some very useful instruction of 8051 instruction set and learn how to write code using these instruction. 16 Jan 2015 I see countless uses of this basic Delay, usually for milliseconds. Register is used as a counter. The issue of security is very paramount at home doors and safe. Maximum delay has no limit. I have used both the timers in this program just because you can understand how to use both the timers. Jump Loop and Delay Instructions. Circuit Diagram You might be seeing a wall clock running with a 1. This creates a loop of DJNZ Rx, LABEL repeating 500 times and the result will be a  Nov 28, 2012 1mS delay using 8051 timer, delay using looping ,generating square wave Generating delay using pure software loops have been already  The delay length in 8051 microcontroller depends on three factors: The first method is simply using Loop program function in which Delay() function is made or  This is a truly lousy way to generate a time delay. Note that, without some simulation studies or prototyping, we cannot easily determine how long this delay will be. For an 8051 microcontroller clocked by a 12MHz crystal, the time taken for executing one instruction cycle is 1µS and it is according to thTime for 1 instruction e equation, cycle= 12 /12MHz = 1µS 8051 microcontroller programming: Interfacing with push button and displaying the button pressed using Keil June 28, 2016 Displaying the number of the corresponding push button pressed on a seven segment display. Timer in 8051. so lets start jump and loop: As you know in Assembly programming language we don't have if. In this program I have generated 50ms sec delay through Timer0 and 50 ms delay using Timer1. Embedded C Programming Tutorial (8051) For writing the program the embedded designers must have sufficient knowledge on hardware of particular processor or controllers as the embedded C programming is a fully hardware related programming technique. Even though there are many high-levellanguages that are currently in demand, assembly programming language is popularly used in many applications. The combination of 250 and 248 in the for loops take approximately 1millisecond of the controller’s execution time. Embedded C programming language is most frequently used for programming the microcontrollers. 32 seems large but when you working with seven segment, keypad, LCD, ADC etc. edu is a platform for academics to share research papers. Now we will discuss here that how to write first program in Keil software for 8051 microcontroller and converting it in hex file. But why? It’s a lot easier to make it that way. You can use millis() for timing inside a for loop but why would you as that effectively blocks program execution just as much as using delay(). h&gt; void delay() { unsigned int j; for(j=0;j&lt;1257;j++); // for 1ms delay } void mai In this tutorial we learn about how the 8051 LED interfacing with delay generation is done . In your code example, an intrinsic delay function is used to delay for 10ms. This AVR tutorial will explain the procedure to follow in calculating the execution time for a piece of AVR assembly code which contains only single loops. Besides, they are used for generating clock pulses that can be used in serial communication, so called Baud Rate. Generation of time delay is most important concept in embedded systems. We have used on chip Timers of 8051 to create delay. Let’s get started. A delay through timer is more efficient where processor is free to perform other tasks. 255 µs Delay can be increased using NOP instruction or using nested loop. void Yes, a classical 8051 performs 1 instruction cycle per 12 clock cycles, 28 Dec 2017 How do I make the time delay of 1ms in 8051 microcontroller using Software delay routine in 8051. I dont know how to get a delay loop for the 35ms. program implementation in 8085 below, calculate the total delay time LXI B, loop + delay of the loop] 6 Marks 2/4 b) Given that the crystal frequency of 8051  In this chapter, we will cover the register configuration for timers in 8051. This sort of delay is very simple, but for real applications it is usually necessary to do something while waiting, other than executing NOP instructions. One functions is used to flash the LED by changing the state of glow and the other function is used to insert a delay of 1 second in between the interval. The clock source to create the time delay is the crystal frequency of the 8051. a minimum delay can be one instruction cycle. Since it is not documented nor defined it is not recommended that it be executed. ppt), PDF File ( . Mov B, #250 SECTION - III TIME DELAY CALCULATION IN 8051: What is Machine Cycle in 8051 microcontrollers?: The CPU takes a certain number of clock cycles to execute an instruction. MHz microcontroller clock frequency cycles for CALL/RET or other overhead ns us ms s mins hrs days. Generating delay using pure software loops have been already discussed here but such delays are poor in accuracy and cannot be 8051 timer generate delay. The length of the machine cycle depends on the frequency of the crystal oscillator connected to the 8051 system. 1 Loop and Jump Instructions 3. The circuit diagram for LED interfacing with 8051 microcontroller 89S52 is shown in above figure. Loop technique and using timer for generating delay in 8051 micro controller. 085μs = 1630. For different chips its need to be tested with an oscilloscope. Typical current ratings ranges from around 1 mA to above 20 mA and voltage is at about colors. to test delay of the above loop try putting breakpoint before and after calling the function delay, and see how much time it consumed. The above program sets the least significant bit of port 1 and then calls the two-loop delay, after which it clears the least significant bit of port 1 and calls the three-loop delay. Pin 31 (EA) is connected to Vcc, which is an active low pin. while loops. Their main purpose is to measure time and count external events. I have used ATMEL’s 89C51 (40-pins DIP) 8051 architecture microcontroller which is ideal for first time learning MCU Chip. 5μs + 3 x 1. How Arduino benefits by avoiding Delay? I/O Port Programming in 8051 (using Assembly Language) So far we have discussed the basic setup required for initializing the microcontroller and now comes the interesting part i. Using a simple loop logic; Using internal timer register CHAPTER #2- CALL, LOOP AND JUMP INSTRUCTION IN 8051In the sequence of instructions to be executed, it is often necessary to transfer program control to a different location. 5ms for 90 degree, 2 ms for 180 degree. A few examples are shown. Main Loop: As we know basic concept of displaying values in 7 segment LED display. Buy it online using our Shopping cart & it will be shipped anywhere in India. I dont need a accurate value. for loop delay calculation. It can be used for direct hardware manipulations. Port 0 as Input : With resistors connected to port 0, in order to make it an input, the port must be programmed by writing 1 to  The watchdog timer is loaded with an initial value greater than the worst case time delay through the main program loop. Academia. Programming can be done in C language or assembly language. – uint8_t cnt; int i,j; //automatic variables – visible only within delay() for (i=0; i<100; i++) { //outer loop for (j=0  Feb 24, 2005 It also provides the flexability for generating delays and timeouts with more Generally, when the polling loop does not need to contain code to  Nov 5, 2009 provides the minimum delay between the convert start signal and end of and loop variable maintenance outside the "PSWE = 1; PSWE  Jun 29, 2013 sets of 8 LED's connected to the port P2 and P3 of the 8051 Microcontroller. For more… Make a subroutine that will generate delay of exact 1 ms. It's a bit tedious to adjust the timing, and interrupts will mess with the process, but it works. 0. Adding the two instructions outside loop we have 1627. delay();. e. If the target 8051 does not loop SOFTWARE DELAY ROUTINE IN 8051 In an 8051 microcontroller, it requires 12 cycles of the processor clock for executing a single instruction cycle. This article describes the two basic methods i. This chapter deals with how AT89S51 is successfully used in an LED blinking application. The algorithm for this 0 to 9 counting program is with delay and for loop. 0 of 8051 using timer #include // include 8051 register file sbit pin = P1^0; // decleare a variable type sbit for P1. 085μs = 1627. crystal frequency is 11. So all delay will be created using value 1275. That means, the timer clock input will be 12MHz/12 = 1MHz Now we have to keep this pin to Logic 1 for 1ms to rotate it 0 degree, 1. We declare few variables before using the super loop. The code has been tested on Ultra_X51 development board by xplore labz. Secondly, it can be used to repeat or initiate an action after/at a known In this section we will see how to write and execute programs for 8051 microcontroller using the Keil Software. we create loop and delay using some Jump instruction. carry out input/output operations. DNA Technology is an online shop for Electronic components, Modules, Kits, Sensors & Degree, Diploma Engineering projects. 3 Section 3. 8051 Microcontroller is a programmable device which is used for controlling purpose. Designing a delay program using 8051 timers. 0 This purpose of this tutorial is to familiarize with the use of push button switch with the microcontroller. delay instruction in 8051. lFor 8051, 12 clock cycles are minimum needed per lSimilarly any delay can be obtained by loop within loop technique lFor much longer delays, use timers. Program for generating 1mS delay using 8051 timer. A function named ‘delay_usec()‘ is implemented in the code, which produces the delay in micro seconds (If 12Mhz crystal is used with 8051). 2 Sections 3. I just want to use this delay for button debouncing. 8051 instruction Set - Jump Loop and Delay Instructions Vishal Nair. In C programs you cannot be sure of delay, coz it depends on compiler how it optimize the loops as soon as you make changes in the options the delay changes. As 8051 has no internal i2c, I have used bit banging method to generate clock and data for serial communication. In 8051 there are two timers one is Timer0 and the other one is timer1. And because of square wave 10 ms ontime and 10 ms offtime. if its prime a led will flash using delay with counter R6=3 Loop counter for 100 program loops (unsigned). interfacing dot matrix led display to 8051 An LED dot matrix display consists of a matrix of LED’s arranged in a rectangular configuration. Here Timer 0 of 8051 is used and it is operating in MODE1 (16 bit hi all could any one pls tell me the coding to calculate 1 sec delay in embedded c for 8051 controller without using timer!!! i. How to calculate a for loop delay? Hi, I'm trying to make a 1 ms delay using a for loop. How to Delay in C. Write a simple delay program using for loop statement and use this delay between the toggling of any output pin of 8051 microcontroller. Software delay routine in 8051. The time delay inside HERE loop is [250(1+1+1+1+2)]x1. Need more explanation on delay function. making a loop and divide the desire number with 99 first then check if prime or 4. , [code]#include<reg51. CIRCUIT DESCRIPTION. how to program 8051 using assembly language i. Then the implementation of timer and interrupt are discussed. When the delay gets long, it's often not so fun with a busy-loop since the processor can't do anything else. Did you ever want to make a C program wait for a certain time? You can set up a technique to allow time to tick away, for example: when showing a splash page (a notice or hint) for a game. Nov 16, 2012 Sine wave generator circuit using software delay in 8051. 8051 led toggle program code You might have seen a " Hello World! " program code example while learning some programming language. or if you project have many parts to operate simultaneously then you definitely need to multiplex some of ports. 1) Though not accurate method for time delay. 755μs TIME DELAY FOR VARIOUS 8051 CHIPS Large Delay Using Nested Loop Find the size of the delay in following program, if the crystal frequency is 11. Using the 8051's Built-in Timers The 87C52 chip on the development board includes three built-in timers, two of which can you easily use in your applications (Timer 1 generates the serial port baud rate and usually can't be used). Sample Code by DNA Technology. The 8051 is built with hardware timer/counters that are designed to produce a signal after a  Aug 16, 2008 Hello, I am programming 8051 microcotroller in assembly and I'm trying One classic way to make a delay is to use nested decrement loops. While it is useful for getting familiar with the basics of that language, it also gives you a head start in that environment. This 1 second delay can further be used to generate 1 minute delay. The choice is enormous, so the time you need to find all these resources is usually the time you should be investing in This example is a simple and unsophisticated software delay using a busy loop. Since the running timer is updated every 12 clock cycles by default to maintain compatibility with the 8051, it will be updated 921,600 times per second. This article is contributed by Pratik Chhajer. 0592MHz. These clock cycles are referred to as machine cycles. 0592 so 25 micro second. Machine Cycle DELAY: MOV R2 This post provides the delay function implementation using timer0 ( in c language ) for 8051 micro-controller ( e-g for AT89C51 or AT89C52 etc ). Post in the forum then everyone will benefit from seeing the questions and answers. 2 Call Instructions 3. Here is implementation with a delay function. Using a simple loop logic Giving a proper delay like 1-Second OR 1-Minute is possible only by using internal timers of 8051(89c51,89c52) microcontroller. I intentionally do not want to use a timer for this. 10ms x 100 = 1000ms or 1 second. In this instruction, the register is decremented; if it is not zero, it jumps to the target address referred to by the label. * Now the counter loop begins. The schematic can be downloaded from product page. delay program in 8051 in c. The default setting is for an 8051 running at 33 MHz. lcd initialization in 8 -bit So this delay can be made either with a delay loop of specified time more  Mar 18, 2016 3. There are many instructions in the 8051 to achieve this goal. A normal delay function might be using for loop iterating for a few 1000 cycles. The entire code has been tested with 8051 microcontroller and it will work with any microcontroller with minor changes. Instead construct a delay loop and that will use much less space. Oct 13, 2011 why we put 1275 in for loop for 1 ms . While(++i) is a loop which keeps on incrementing the value of i and give it to  May 20, 2013 unsigned int i; /* will be used for a delay loop */. . The program shown below can be used for generating 1mS delay and it is written as a subroutine so that you can call it anywhere in the program. 3 Time delay for  ACALL DELAY CPL A SJMP BACK. But, an interesting thing is, if you want to tick a clock in real time applications, the only solution is to use RTC (Real Time Clock) to get Date and Time. In an 8051 microcontroller, it requires 12 cycles of the processor clock for executing a single instruction cycle. Download Keil. Value of 1275 works well enough for a millisecond delay. The AT89S8253 has three timers/counters marked T0, T1 and T2. So for 10 ms we shall send 1 to port pin and for another 10 ms send 0 in continuous loop. LED Blinking-AT89S51 This loop will keep running until the variable Timeout_loop reaches its maxi- mum value (assuming 16-bit integers) of 65,535 and then overflows. Recently while writing a program on embedded c for 8051 to run a robot using ultrasonic sensor I got into a problem. The 8051 supports 255 instructions and OpCode 0xA5 is the single OpCode that is not used by any documented function. Video results of how to use 8051 timer to generate delay Now if i run 2 ms delay for 500 times it will generate 1-Second Delay. It will be useful whenever a decision is to be made according to the press of a switch. E. Letting a timer do the delay (maybe not the full delay span but at least suitably long sub-delays of maybe 1ms or 10ms) means the "main loop" can continue to update blinking LED concurrently with looking for key presses etc. else and for, while, do. Each instruction takes one clock cycle to complete. I am a beginner to this KEIL. There are many ways to create a time delay using 8051 however no methods will be precise to above method of creating delay using inbuilt timers One classic way to make a delay is to use nested decrement loops. Basically 8051 controller is Mask programmable means it will programmed at the time of manufacturing and will not programmed again, there is a derivative of 8051 microcontroller, 89c51 micro controller which is re-programmable. Delay was used by calling the sub routine in the main program. Let us see how it is done. The for loop hast to be included in order to call the desired time delay for a no times so that the loop can achieve the desired time delay in the range of seconds. Take an example of creating a delay of 10ms using timers of 8051 microcontroller. The assembly language is a low-level programming language used to write program code in terms of mnemonics. Is it possible to run two while(1) loops parallelly? To use delay function in your program you should include the "dos. which offer 32 pins for connecting external devices. Also you can put this in a loop for creating longertime delays (multiples of 1mS). AT89S51 is a microcontroller coming from the family of 8051 microcontrollers. P0 = 0;. /*. The three-loop delay itself calls the two-loop delay ten times. e using for loop and pls explain it thanks in advance The basic program structure we require could be based on a SUPER LOOP [page 162] as follows: We could then measure the pulse frequency we obtained, using an oscilloscope or a software simulator. 0) will be off for approximately ten times longer than it is on. #30H ; data to be sent to LCD is stored in 8051 RAM, starting at location 30H loop: the delay between pressing Everyone says that it’s bad to use loops for delays in microcontrollers. If I run this loop for 1000 times, I get a delay of approximately 1000ms or 1 second. 2 Call instructions 3. If you are not yet started with 8051 with Keil C please refer this tutorial Blinking Led using 8051 and Keil C. In next tutorial, we’ll add switch to our microcontroller project. Here is the download link of Keil. Join GitHub today. The same thing is written in delay function. 1 Loop and Jump Instructions. When this happens, the program will continue. Now we have to keep this pin to Logic 1 for 1ms to rotate it 0 degree, 1. Circuit diagram of the project is given below. It is in a loop of 100, which results in a one second delay. – 8051 jump instructions Do Action First Test the condition later –DJNZ, JZ, JNC  Mar 18, 2014 4. 085 µs = 437. The desired character or graphics can be displayed by switching ON /OFF a desired configuration of LED’s. Therefore, the LED (on P1. However, based on my research, executing this undefined instruction takes 1 machine cycle and appears to have no effect on the system except that Operating parameters & circuit symbol – Above figures show basic elements inside the LED and circuit symbol which helps in interfacing LED with 8051. Everyone wants to be as much secure as possible. Security is a prime concern in our day-today life. Crystal used is of frequency 11. While designing delay programs in 8051, calculating the initial value that has to be loaded inot TH and TL registers forms a very important thing. This library can be used for anyone starting with 8051 family of microcontrollers. Multiplexing is very essential part while working with 8051 because of its limited number of ports. It can be found in a vehicle’s music system, in an automatic door, in clock rooms to automate the systems and various other common applications. A bit of multiplication tells us that it takes 50 ms to count from 0 to 46080, which also tells us that we can start a 16-bit timer at 19456 and wait for it to overflow 20 times to delay for 1 Dear Friends, Thank you all for the useful reply. Please do not send me PMs asking for help. Tags 8051 time In this function, we use a super loop in which we alternately call two functions LED_FLASH_Change_State(), and DELAY_ LOOP_Wait(). Time delay generation was one of the important concepts dealing with the 8051 Microcontroller and also it holds significance in almost all Mc applications. g of Loop delay in Assembly. If Program To blink an LED using 8051 based Controller. Delay Loops - PIC Microcontroller Tutorials - There is one slight drawback to our flashing LED program. In this tutorial we learn about how the 8051 LED interfacing with delay generation is done . This is all for this tutorial to Blink LED with 8051 Microcontroller. The step included in generating delays is a) determining exact required delay b) selecting instructions for delay loop c) finding period of clock  Generating accurate delay using Microcontroller timer counter with interrupt timer Now design your super loop (while(1) loop) with your task and use time  interfacing tutorial with microcontroller PIC, 8051 and AVR. Every time the inner loop counts down to 0, then the next decrements, and so on. The 8051 series microcontrollers have two build in 16-bit timers Timer 0 & Timer 1, Some also have an extra timer Timer 3 . h" header file which is not a part of standard C library. Inside super loop, for loop will be executed 10 times first it will give some delay. 5μs. If we are using a 4MHz crystal, then each instruction will take 1/4MHz, or 1uS to complete. i want a delay of 1sec. If C/T = 0, the crystal frequency attached to the 8051 also decides the speed at which the 8051 timer ticks at a regular interval. Every now and again we take a look around at the 8051 microcontroller to select the best tutorials, simulators, compilers, programmers and present them to you in a brief overview. Assume the processor is clocked by a 12MHz crystal. g. you can find 8051 timer calculator by googling. Dear Friends, Thank you all for the useful reply. The 8051 is built with hardware timer/counters that are designed to produce a signal after a user programmable delay. For an 8051 microcontroller clocked by a 12MHz crystal, the time taken for executing one instruction cycle is 1µS and it is according to the equation, Time for 1 instruction cycle= 12 /12MHz A loop provides delay before executing next instruction and the processor does nothing during the wait period, except for executing the loop. Solution: - 50 Hz means 20 ms. Delay in C program If you don't wish to use delay function then you can use loops to produce delay in a C program. Timers & 8051 Timer Programming. This chapter covers the control transfer instructions available in 8051 Assembly Language. e. pdf), 3. Basic idea is to get current clock and add the required delay to that clock, till current clock is less then required clock run an empty loop. Use this delay to generate square wave of 50 Hz on pin P2. 3 Time Delay Generation and Calculation. /* First, Port 0 will be initialized to zero */. 8051 | Programming Part 1 In this video using KEIL, the process of writing delays, loops and performing memory operations in 8051 is discussed in detail. I want to make the delay like this: In this post, we will see how to give a time delay in C code. For an 8051 microcontroller clocked by a 12MHz crystal, the time taken for executing one instruction cycle is 1µS and it is according to the equation, Time for 1 instruction cycle= 12 /12MHz = 1µS How to implement precise delay function in Keil c51 (for c8051) that waits exact amount of CPU clocks, the number of clocks ranges from 1 to 255 loop delay etc In this tutorial first an introduction to Embedded C is given. my osc freq 11 Home » Forums » Microcontroller » 8051 » delay in c Normally we assume 1us for a single loop, but it won't help you This is called a "blocking delay" because the microcontroller is blocked from doing anything else because it is busy counting. GitHub is home to over 36 million developers working together to host and review code, manage projects, and build software together. 1 Loop and jump instructions 3. NOTE: This is in fact the main delay code I use in my 8051 Microcontroller projects. A Timer is used for producing precise time delay. 8051 for loop delay

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