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- #Simple delay function for 8051 in c how to#
- #Simple delay function for 8051 in c serial#
- #Simple delay function for 8051 in c software#
- #Simple delay function for 8051 in c code#
After loading the values to the register, the timers must be started. The timer value for the required delay needs to be loaded into Timer Count registers TH(which is copied to TL). The timer in Mode-2 can be used as an 8-bit timer to count from 00 to FFH. At this point, the timer values must be reloaded and the overflow flag should also be cleared. Now the Timer starts counting up and once it reaches the max value(0xffff), it rolls back to zero setting the overflow flag. The timer value for the required delay needs to be loaded into Timer Count registers TH & TL.
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The timer in Mode-1 can be used as a 16-bit timer to count from 0000 to FFFFH thus allowing to generate a wide range of delay. RegValue = TimerMax-(Delay/tick) = TimerMax - (Delay/1.085us) Now the Timer value for the required delay can be calculated as below. Time to increment the Timer count by one(timer tick) can be determined as below.įor Fosc = 11.0592Mhz, the tick time will be
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When you press the (+) button then it will add the two digits. The library file reg51.h contains the definition of all the special function registers. Design a Simple Calculator with 8051 Microcontroller. This can be accessed as 2 eight bit registers TL0 and TL1. Writing a simple C program: The first line in an 8051 C program is. Once it reaches the Max value, it will roll back to zero setting up an OverFlow flag and generates the interrupt if enabled. The timer is nothing but a simple binary counter that can be configured to count clock pulses(Internal/External). The microcontroller can also generate/measure the required time delays by running loops, but the timer/counter relieves the CPU from that redundant and repetitive task, allowing it to allocate maximum processing time for other tasks.
#Simple delay function for 8051 in c serial#
Timer 1 is also used for generating baud rate in serial communication, which we will discuss in the next tutorialīelow table provides the details of the 8051 Timers.Īs the name suggests these are used to measure the time or generate the accurate time delay.
#Simple delay function for 8051 in c code#
I have also added the Proteus simulation file along with the hex code of the program, check it out for better understanding.8051 has two indepenndent timer which can be used as timer(to generate delays)/ Counters(count external events).
#Simple delay function for 8051 in c how to#
Hope you all have understood the operation of timers in a 8051 Microcontroller and how to generate specific timing delays using it. If(count=38) //Toggle the status of port 2 if the count reachces 38Ĭount=0 //Clearing count value to restart counting
#Simple delay function for 8051 in c software#
TF1=0 //Clearing the TF flag through software to continue counting. If(TF1=1) //Checking the timer overflow flag for completion of count TCON=0x40 //Starting the timer1 (TR1) refer the above diagram of TCON reg TL1=0x00 //Setting lower bits of timer register TR1 to 0000 TH1=0x00 //Setting upper bits of timer register TR1 to 0000 TMOD=0x10 //Selecting timer mode M0 (T1M0) refer above diagram of TMOD reg So TF1 is set for every 0.131 seconds and we need to increase the count and clear the TF1 flag for every increment we make.įor a delay of 5 Seconds we should give a count value ofġ0sec/0.131 = 76 (For ten seconds delay) PROGRAM: #include We are here using 6MHz crystal, then a single machine cycle will takeĮach count takes 1/0.5 MHz resulting in 2us, so when timer1 counts from 0000H to FFFFH (65535 counts) it takes One machine cycle is the 1/12th of the frequency of the crystal attached to the controller. The value of the timer register increases by one after every machine cycle. Circuits Library - 220+ practical circuits FIVE SECONDS DELAY: