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Timers can have prescalarsand/or postscalaNassociared with rhem that can be used to multiply the timer setting by a limited numberof integer countsThe scalitg ability is not adequate allow all exacttime intervalsto be createdbut is adequate all practo for tical purposesTo the inability to createperfectly timed intenupts, we have to add the uncertainty in the fiequency of the oscillator crystal, which is usually rct exacrly what it is statedto be (andwhich is affectedby the ambienttemperature the circuirry warms as up) Thoughfairly accurate timings canbe achievedwith the hardwareasrec ived,addi tional software adjustmentsmay have to be added if exrremely accumte results are desiredThe softwarecan be designedto make a correctionto the timing every so often to make it more accurateWe will also need an extemal sourc that is at least as accurate as we want our timer to be, so we can veriry the acclrmcyof the device we create
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l- t's write a simple program to seehow Time works We will usethe LED bargraph to show us what is going on inside the miqocontroller As always, the bargraphis connectedto the eight lines of PORTD o{ the LAB Xl First,Iet's write a programthat will light the two LEDSconnectedto D0 andDl alter nately(SeeProgram61) Having them light altemarelylersyou know thar the program is running, or morc accurately,it lets you know that the segmentof the program that conlains pan of thecodeis workingThese this two LEDSwill be used repr sent to the foreground task in our program There is no timer processin this program at this srage There are no interrupts The programjust blinks the LEDS programblinkstwo LEDS Foreground (No alternately timeris being lF!i0E!]!ffiS: usedin thisprogram atthislime)
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CIEJAR DEFINE OSC { TRISD t11110000 PORTDI - 1 IIIIPHA 1IAR WORD MAIAILOOP ! IFPORIFD1=0XHEN PORTDI = 1 PORTDO = O EIJSE PORTDI = O PORTDo - 1 EI1IDII' FORNTPSA=1TO300 PAUSTOS 100 NEJI(T II,PIIA GOTO MAIIILOOP END
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loop replaces a lonq pause comand short pauses thal are essentially
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The useof the PAUSEUSloop in the Prognm 61 Fovides a latercy of 100microsec onds (worst case)jn the rcsponseto an jnlemrpt and eliminates most of the effect of It changingthe OSC irequency if that shouldbecomenecessary is better than nsing an empty counter, which would be completely dependentof the frequency of the system oscillator (There is an assumptionhere that the 100 psec latency is completely tolerable to the task at hand, and it is for this program It may not be for your real world pro gramthough,so itmay needto be adjusted) We are tuming one LED OFF and anotherLED ON to Fovide a more positive fe dback As long as we are executing the main loop, the LCDS will light alternately and prcvide a dynamic feedbackof the operation of the program in the foreground loop we select a relatively fast ON OFF cycle so we will better be able to see minor delays and glitches that may appearin the operation of the program as we proceed Run this Fogram to get familiar with the operation of the two LEDS Adjusl the (the300 value)to suityour taste counter Next, we want 1oadd the codethat will interrupt this progmm periodically ard make cycle This will a third LED go ON and then OFF using an approximately one-second seNe asthe inlerrupt'ddven task we are interestedin learning how to createThis is the IMPORTANT task in this pa icular exercise Herc is what must be addedto the plogmm to get the intenupt-dnvenLED operational EnableTime0 and its inte[upts with appropriateregister/bit settings Add the ON INTERRUPT commandto tell the prc$am where to go when an interSet up the inlerrupt routine to do what needsto be done The inteffupt routirc countsto 6 1 and turns the LED ON if it is OFF and OFF if it is ON Clear the illterrupt flag that was set by Time Sendthe program back to where it was intenupted with the RESUME command
WHY ARE WE USII{G 6I Theprescalar setto 64 Oits0 to 2 aresetat 101h theOPTIONREG) is Thecounter interupts every256counts , 256x 64= 16 384 Clockis at4,000000 Hz Fosc/4 1,000,000 is = 1000000/ 16,384 610532Its exactly butit is close not 61, enough ourpurtbr Thelines in ofcodenowlooklikethose kogram62
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