![]() ![]() Time to increment the Timer count by one(timer tick) can be determined as below.įor Fosc = 11.0592Mhz, the tick time will be The TR bit of TCON register is used to start the timer.ġ = External count source T0/T1(P3.4/P3.5) pin.Ĩ051 Oscillator frequency is divided by 12 and then fed to the controller,.The C/Ṫ = 0 bit of TMOD register selects operation of Timer/counter unit as timer.Thus timer increments every (1/921Khz) = 1.085μ seconds. Thus if a 11.0592MHz external crystal is used, the timer uses a frequency of 921KHz. The clock frequency is divided by 12 and used by the timer unit. ![]() ![]() The registers TCON and TMOD affect the timer operation. The 8051 timer and counter are the same units, but in this tutorial, we will discuss only the timer unit to simplify the discussion. This can be accessed as 2 eight bit registers TL0 and TL1. 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. 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. ![]() �0��W����k�T)�bq�PppN���W.8051 has two indepenndent timer which can be used as timer(to generate delays)/ Counters(count external events). Source : )/Rect/Subj(Typewritten Text)/Subtype/FreeText/T(Parithy)/Type/Annot>endobj226 0 objendobj227 0 obj/ProcSet>/Subtype/Form/Type/XObject>streamĮndstreamendobj228 0 objendobj229 0 objendobj230 0 objendobj231 0 objendobj232 0 objstream ![]()
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