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schemalic agram d lrlFiiiiiia:d:3lrl TheLcDdisplay wiring (An easylo-comprehend just r and ihe showing the llnesbelween micfocontrolle lhe 2 x 20 dispaynrodule-)
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in r'iP-ioCiittu!4]l Displavins blinking"HELLOWORLD" the LCDdisplay and
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For the LCD displal rcgistcN oD the LAB XL CLE]AR DEFIIIE DEFINE DEFINE DEFITIE DEFINE DEFTNE DEFINE
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rc theDEFINE statemenls asfollows:
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OSC 4 LCD DREG PORTD IJCD RSREG PORTE I,CD RSBIT O IJCD EREG PORTE ItrCD EBIT 1 LCD RWREG PORTE I ; ; select , ; enable ; ;
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These DEFINES
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LCD DISPIAY
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DEFINE DEFINE DEFINE DEFINE DEFINE
Disprayins bllnking"HELLOWORLD" the LCDdisplay and in
I,CD RVIBIT 2 NCD-BITS A I,CD I,INES 2 ICD COMMANDI'S 2 0 0 0 ; delay I,CD_DATAUS 50 delay
in rnicio in nicro
seconds seconds (nust set) all of PORTD
\ ep ^e L c Lds olr -p--s :
Set Lhe port directions
DooFv6r 'ho!ot aod qtl oI PORTI "s o'-p!i Doo D /dl oe set ds lines Th- lo! l bbl- ii path Lo feed the LCD) a 4 high bit
we are setting
PAUSE 500 ERISD = %00000000 TRISE = %00000000 ADCONI=%00000111
I,CDOUT SFE, 1 PAUSE 250 LCDOUIF \HELI,oZ LCDOUT tFE, SCo I,CDOUT \![ORLDZ PAUSE 250 Gctro LooP EIID
LLU srarEup rlnes !o ouEpur s e r a l l P O R T El i n e s ! o o u t p u t oo--o-Drqi ra co-L-o -eg sLor needed for the 16F877A - see above and below this nakes all of poris A and E disitaL the main loop of the program clear screen, go !o position 1 pause 02s seconds ; go to second 1lne, ; Pause 025 seconds ; all progxans must end in END frrst position
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Before we can write to the LCD we have to define how the LCD is connectedto the MCU Also, since the 16F877A has sone analog capahilities, it w,ill stah p atul rcset in analog rnode,and has to be changedto digital mode (for PORTE onb in ow imme diate case)before we can use its digital properttes The compiler manual tells us we have to specify the location of thl3LCD and spec ify the confit lines connected it so the compilercanaddress deviceproperlyDoing to the so lets us placethe LCD whereverit's converfentfor us when we designour own devices(and the compiler will still be able find it) Thesevariables are to be specified in DEFINE statements before any of the rest of the program is written (In thjs book, we will alwaysplacethe LCD at the sameaddress locations usedby the LAB Xl so programsfor our insffumentson the LAB Xl when we need to,) we can test all our Program54 demonstrates most elementarycontrol over oulpul to the LCD dis the play Variations of theselines of code, and the addition of a few commandcodes,will be usedto write to the LCD in all our programs Not all the precedingDEFINE statements neededon the LAB-XI, but when you are build your own devices,you will needto include them all to make surenothing hasbeen omitted You neverknow what state anMCU might startup in, so coverallyourbases
GONTROLLI THEOUTPUT G AI{DREADIIIG II{PUI THE
I Controling the Digital andAnalog Settings
ADCON1 = Analogto Digital CONtrol register#1 The ADCONI=700000111 statement, one lil(e it, is needed the 16F877A or ior because any PIC MCU processorthat hasany analogcapabilities at all comesup in the analogmode on reset and startupThis particular instruction puts all the analogpins on po(s A and E into the digital mode Since we need or y PORTE and PORTD for con trolling the LCD, noneof PORIA needsto be in digital modeI am showing E 000001I I because the examples all usedby nicroEngineering Labs in all their literature andon theirWeb siteuseandsuggest singthisvalueSeedatasheet moredetajled inforfor mation(Theuseof thisregister alsodiscussed greater is in detailin If you 9) want 1otum just the three available lines on PORTE to digital, you can useany binary valuefrom 010 to 111inclusive The conlrol of the A-to D conversion capability is managedby the 4 low bits of ADCONI For our purposes, 0 and bit 3 are not relevantSeepage 112 oI t}te bit datasheet detailed information on this for (it Bit 0 is not relevant the LCD operation is a "don't care"bit) to Bit I and 2 must be set to 1 to make the two pots (A and E) digital (it, Bit 3 is not relevant the LCD operation too,is a "don't care"bit) to SoADCON I = '/000001I 0 or %0000011 would be adeouate our work (Wecould I for also havedonethis in decimalformat with ADCON 1=6 or with ADCON1=7)
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