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IIfECON-0 ELSE ENDIF GOTO MAII{ END
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Demonstration ofthe use ofTMRoas a Counter(Contitued)
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in In Program174,we pressSWI againandagaina seewhat happens the LCD For eachkey press,you needto both releaseand hold the button down for a good part to the of a second actuallyobserve key-downandkey-upeffectso that the 750 pause that allows us to look at the LCD can be discounted
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We will use lr ert as the counterfor the marblesbecauseit is the only timer that can count to more than 255 without having to count fhe interrupts at every overliow of the designated It counter andnake therelated calculations will countto the 1000marbles jn Mr Marbles'specification Actually, the microprocessoris much faster than the marblescoming out the chute, but we will pretendthat we needto really hurry in our counting prccessfor someother prccesswe mjght encounterin the future we If the marblesare coming so fast we do not havetime to updatethe registers, have to set up an inlernal counterand feed the signalsthat the intenupt provides beforethey can be The signalswill haveto be debounced directly into that counter fast and will thesecounten arc extremely to t}Ieintemal counterbecause connected pick up everylitdejitter as a countable event
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BEING II{TO A TITUER THE BASICSOF COUI{TII{GDIRECTLY USEDAS A COUIITER
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In order to use a timer as a cou er, $Ie must set up the timer as usual and then change the input to the timer from the intemal clock to the external signal and set the appropriate pammetersfor ihe incoming signal (rising edge, and so on) For Timerl the 16-bitcounter is doneas follows: this Setiins TimerluDasa countef
T1COriI4 antt tlCON 5 = 0 PIE10=1 I&aCON6=1 T1CON0=1 for no pre scale to enable intelrupl ro start the counter We have to
E1CONl=1 t1CON3=3
lncomlng s1gnal selects PORTC0for input "lso --d-d oe ecc DOol^0lo- -np,L
us|l|G tlMERl |l{ couNrEB ltoDE
tlole 1 The intetnqt fag at PIRI 0 trill be set \')hen the counter owtnows (and would hare to be cleared in the interrtrpt tetfice ft)utine-our count will ne')erget that in oreilov) fa\ but v,e stillneedto be awareofthi!) Weare not intercsted thecounter in thispa iculat applicationbecduse will nerer countpdst 65635,but if we were rre to count ast thaL the code to rcset the interrupt lag dnd keep t lck of the overfo\)s wouLdhaw to be a&Ledto the progran at the appropriate location It miSht ercn be stap we necessary closeo e of thegatzs(meaninS: avery fitstprccess)bejbre gat to to v,e got this done the o)eilow to stop ewrythine while (Figure 175)so you lully undcr for Studylhe wiring diagram the marblecouoter standhow the hardwareis wired on the controller In thisprogram, eachmarbleinteruptsthelR bcam,whichfeedsinto 80, the inter pin the rupt receiving Any change B0 causes interrupt in an andde bounces incoming
1 2 3 5 6 7 8 9 10 12 l3 15 l6 17 18 19 20
39 3a 37 36 35 33 32 31 30 29 2A 27 26 25 23 22 21
o oO-
IVARBLES
22 Plcolarad Capacitors
(The lorcounling marbles inlo counterTMR1 fourPORTD and lFiirniitllt;!::i Wiringdjagram go with in thethreePOBTEines,marked circles lhe ligure, to the LCD)
UIDERST NoI G tHE COUIIERS: COUNII|{G MARBLES
pin an signalbecause intenuptcanonly be se!onceThe intenuptroutinetoggles B4 pinB4 is connected the signalis fed to C0We are topin C0, up anddown,andsince it using pin C0 because is the only pin thal can be used as an input for the Timer I register pair as indicatcd in the datasheet
IHE WORKINGPROGRAIU
fundamentalTMR I operationas a counlcr lor the marblesAs writ Program 175demonstmtes is Displays showLrs followingthings the the tenit counls nunbcr of lines PORTB0 grounded't\tO\ i6g sro B register (too fast to sea odd poLs- -I jor see, add pauses if "rr 'o
you ranr
TMR1L and TMR1H registers are ltorking connections Connect 81 to C0 to feed Tinerl counter Gromd B0 Lo increment the counter
in 175 Theabove ideas implemented Program are theTimerl routineio countdirectlyto marble countins riatiii!!iiii:!l !!l:i Basic pair 17-5) lor is counter register (The wiring diagram lhisprogram n Fig!re
cL&dR D E F I N Eo s c 4 DEFINE ICD DREG PORTD DEFINE LCD DBIT 4 DEFrtitE LCD_RSREG PORTE DEFrrlE rJcD_RsBtt 0 DEFIAIE I,CD EREG PORTE DEFINE tCD EBIIr L LOW POR1[E2 2000 DEFINE LCD-COM!4aI'IDUS DEFINE I,CD_DATAUS 50 aDcoN1-%00000111 IRIsA=%00000000 TRISB=%11110001 TRISC=%00001111 TRISE=%00000000 X VAR WORD !E1CON=%o000 0011 ; set bils to conLrol Not used ; bitT=o ; biL6=0 Not ,rsed Prescalar=1 ; bit5=0 PrescaLar= ; bi!4=0 osc enable bi! osc off ; bir3=0 time1 Pae'e 56 ; ; ; i ; ; , ; ; ; ; ; always start riLh c1ear Good habit -la o pd (ood holr'
dAtA PORTB de6ne LCD connectioNs 4 brt path register Select port regisler select biL enable poTI enable bit sel low to write only seconds deLay in nicro seconds delay in nicro operation set ADcoNl for diqilal
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