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flip-flop B,B,
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1111 1111
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Em
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ClK ClK
"T
"Tododasas asas enentrtradadasas st staoao 1.1. CLOCK CLOCK C o n t C o n ta d oa d or er e R e g iR e g is ts tr ar ad o rd o re se s 9393 ClK ClK A { A { II :: :: :: :0 :0 1,1, 1010:0:0 1111 1010 :0:01010 :0:01111 11111:1: 1010 1010 1:1: 10101010 10101111 1111 1111 1:1: 11111010 11111111 :0:0 :0:0 1:1: 1010 (co
(co tagem)tagem) II II II II ,, !! II :: II II II II II II II [[ II
I : I I I : I I II II II II II II I I I I I , I I I I I I I I I I I I I I I I I , I I I I I I I I I I I I ---- ReRecici lala arar 0000 Fig.
Fig. -1-1 tatadodo asassisi roronono dede ququatatroro bibitsts
rd
rderer dodo bitsbits no
no imimerer bibinanariri queque cocontntadadoror rereprpresesenentata EmEm ououtrtrasas
palavras,
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que
que MSB,MSB, maismais esquerda.esquerda. SeSe utilizutilizassassernoerno fluxofluxo
direita,
direita, teriamosteriamos qu
qu cocololocaca FFFF
ca
capipitutulolo erernpnpreregagareremomo
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onde IVIV arranjoarranjo
E X E M P L O E X E M P L O 7·27·2 i-pa pa
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194
194 SiSi tete asas DiDi itit isis PrtncfplosPrtncfplos AplApllcalcacoccoc
CLOCK CLOCK
divisao
divisao dede frequenciafrequencia
Solm;ao Solm;ao
en
en dcterrninardcterrninar necessa-
necessa-2:
2: 1000.1000. naonao scraoscrao
10 10
contar
contar atat 11111111111111111111 102310231010
Dh:isao
Dh:isao dede FrFreqeqileilencnciaia
metade metade eLK. eLK. ParaPara
on
ondada ququadadraradada dede
safda
safda temtem
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contntadadoror didit.t.isisoror oror
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EXEMEMPLPL 7·7·
7-3.
7-3. HzHz
de
de 1 H1 H levadalevada parapara urnaurna
necessa-rios rios parapara
Solueae Solueae 4. 4. sarisfara sarisfara -1. -1. qu
qu prprataticicameamentnt qualquerqualquer l o l o
Ouestees
Ouestees dede ReRevlvlsasa
er
erdadadedeirir oufaoufalslso.o.
ck ck adicionados? adicionados?
7..2
7..2
C O NC O N A DA DO R EO R E M O D U L OM O D U L O , o , o obobtitidodo ututililizizananclcl flip-flops.flip-flops.
60 60 60
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2 : V , 2 : V ,
contador
contador pupulele tatadodo ququ nonormrmalalrnrnenentete de
de rnerodosrnerodos
mo
mo trtradado.o. IgIgnono anan
contador contador
Asa
Asa NANDNAND estaesta conectadaconectada na enna entratradada asassinsincrcrononasas
CL
CL ZdoZdo 1'1'5.1'1'5. NANANDND esestitiveve te
te contador.contador. QuandoQuando BA
BA limparlimpar
2.
2. AsAsentradasentradas sasaididasas dodo Hip-flopsHip-flops
C, C,
1. 1.
da
da dodo pulsopulso BAIXOBAIXO dada poucos
poucos nanossegundos)nanossegundos) cocontntacac1a1a paparara s i c 1 a
s i c 1 a
jaja '1'1 n30n30
ex
exisistete mamaisis 3.
3. dede cocontntagagemem portanto,portanto,
ClR ClR lR
lR
Con
Contatadodorere ReReglglststraradodorcrc 195195
CBA CBA 000 000 (len (len 010 010 00 00 101 101 (e
(estastadodo teternrnpoporarariorio nenececessassariorio parapara limpar
limpar contaclor)contaclor)
Embora Embora por
por apenasapenas asas arar 0000 As
As i1i11111,od,oderernono clclizizerquerqu eses contcontadadoror cocontnt dede 0000 (z(zerero)o) 10
10 ciciclcl eses
diferentes,
diferentes, umum cocontntacaclolo dede momodudulolo 6.6. contern
contern umum spileespilee
ou ou glitchglitch
llO llO
ao
ao cocontntadadoror TarnbernTarnbern
ClK ClK ClKClK ClR ClR
=L:)
=L:)
Pulsos Pulsos 1010 1111 1212 de de enentrtradaadapo
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196
196 S iS is ts te me ma sa s D iD ig ig i a ia i P rP r n o tn o t o so s A p lA p l a ca co eo e
safda
safda CtemCtem ururnana frfreqequeuencnciaia igua1igua1
por
por seis.seis. ondaonda dede ndondo si
si etetriri (5(5 ~O~O emem ALTOALTO porpor
apenas
apenas doisdois pulsespulses BAIXOBAIXO porpor quatroquatro ciclos.ciclos.
Dlagrama
Dlagrama
dedeTransleao
Transleao
dedeEstados
Estados
diagrama
diagrama dede transicaotransicao
~ B ~ B
eLK
eLK dodo flip-flopflip-flop A.A. Lernbre-seLernbre-se
ocorre
ocorre umum mudancamudanca dede es-
es-Se
Se prepresumsumimoimo urnaurna coco tatagege ininiciciaia dede 000,000, diagra-
diagra-rna
rna sese alalteterararnrn norma1-
norma1-uma uma
im
im rrrr cocontntadadoror aiai ternporaria-
ternporaria-110, 110,
estavel
estavel dede 000.000. AsAslilinhnhasas trtracacejejadadasas inindidicaca nanatuturerezaza tern-
tern-Estado Estado tsmporarto tsmporarto +5 +5 (a) (a)
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Cancel Anytime. ClK ClK R K R K RR KK 'Todas 'Todas (a) (a) ta ta ternporariamente. ternporariamente. Mostrando
Mostrando OSOS EsEstata dodo CoCo tatadodo
re
respsposostata aoao pupuisis osos dede enentrtradada.a. VaVamomo ananalalisisarar dedetatalhlhadadamamenentete
ce ce sa saidid XO XO 1.1. saida saida tata ReRe EX EX PLPL 7·7· co
contntadadoror apapreresesen-
n-11
11 serasera visfvelvisfvel
Con
Contadtadorcorc RegRegististradradoreore
Solucao Solucao
101
101 2°2° 2222 21
21 esestatarara apapagagadado.o.
para para br
brililhoho nonormrmalal a o
a o e x ie x i r ar a a pa p n an a
Alte
Alterara dodo iViVIoIodudulolo 4 e 4 e EX EXEMEMPLPL 7- 7-Determine Determine D. D.
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198
198 SistemasSistemas DigttaisDigttais PrPrininciciplpleses ApAplilicacaooooeses Solm;fio Solm;fio 0000 0000ateate 1111.1111.AsAs rara NDND aoao D,D, B,B, 0000 0000 alcancada.
alcancada. Assim,Assim, rcrc lmlm tete stst taveis
taveis dede 00000000ateate 11110101 poportrtanantoto urnurn modu-
modu-sera sera 50 50 kHzkHz 2, 2, kHkH
Pr
Prec
eced
ed me
ment
nt
Ge
Gera
ra
Para
Para construirconstruir urnurn conradorconrador queque comecacomeca
te
te ulul
1.
1. DetermineDetermine taltal queque 2'2' :2::2: X,X,
n30 n30 passes passes .3.3 estarao estarao gem gem X;X; EX EXEMEM LOLO 7·7· Construa
Construa contaracontara 00000000
(9
(9 decimal).decimal). Soluc;ao
Soluc;ao 2'
2' 2'2' 1616 lologogo quatroquatro aoao necessaries.necessaries. ComoComo contagern contagern DeB DeB -(9
(9 dedecicimamal)l) tata rnrn coco tete enen rnrninin contadorcontador
.", .",
urn urn
em
em bibinanariri dedesdsd umum cocontntadadoror BCD.BCD. Contadores
Contadores decadicos,decadicos, dodo tipotipo
clevem
clevem sese cocontantadodo osos reresusultltadadosos apresentadosapresentados lglg rnrn
em em
pa
parara didividvidirir rereququ iaia lele lslseses
exatamente
exatamente porpor 10.10.
flip-flop flip-flop A,A,
flop
flop D,D, elel entrada.entrada.
EX EXEMEMPLPL ·7·7 No No necessarionecessario Hz Hz CoConsns Soltu;ao Soltu;ao 2)
2) 3232 2(2( portantuportantu precisamosprecisamos dede seisseis con- con-forme
forme mostradomostrado contaclorcontaclor irir
quando
quando elel alalcacancnc
sa
saididasas clclosos flflipip-f-flolopsps erer erer ecectata
Ouestoes
Ouestoes dede ReRevivisasa 1.
1. sasaididasas dodo ququ deverndevern serser coconenectctadadasas nana
contaclores
contaclores decadicos.decadicos. que
que
IR
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do,
do, masmas facilfacil cornpreende-los.cornpreende-los. NoteNote osos seguintesseguintes pontos:pontos: Q Q , Q b Q Q , Q b Q2
Q2 Q;,Q;, ondeonde LSLSI3eI3e QlQl
LSB
LSB esquerdaesquerda convencao
convencao sinaissinais U111U111
sos
sos contadorcscontadorcs
ordern
ordern dosdos FFsFFs binaria,
binaria,
CP CP
eLK
eLK AsAs entra- entra-I'I' ididenen ifificicadadasas cocomomo CPoCPo CP],
CP],
C~)' C~)'ElasElas
es
estaotao coconenectctadadasas saidasaida dede umum /VIR]
/VIR] jvIRjvIR2020 ondeonde /vIR/vIR significasignifica mastermaster
CPo CPo CPCP CP, CP,- - - + - - + ~- - - + - - + ~ (LSB) (LSB) (a) (a) Co
Contntadadororeses ReRegigiststraradodorere 199199
reset
reset MRMR eses
AL
ALTOTO paparara lirnparlirnpar DODO.DODO.
4.
4. OsOs ninip-p-flflopop ],], QzQz Q,Q, jaja umum ta
ta sasa dede trestres bits.bits. flip-flopflip-flop QoQo 11301130
te
te IsIstoto pepermrmitit susu opcao
opcao dede conectarconectar ,),) QlQl parapara foforrrrnana umum con-
con-,),) sejar. sejar. lili gar gar ex
exerernpnplolo ususararememosos do
do nana Fig,Fig, 7-8Cb).7-8Cb).
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Cancel Anytime. Apltcacoes Apltcacoes C u C u 5:10 5:10 74
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Todada asas enentrtradadasas JeK JeK ClK ClK ClKClK ClKClK Entrada Entrada C o n t C o n ta d oa d or er e R e g iR e g is ts tr ar a o ro re se s 203203 Contagem Contagem 111 111 (CSA) (CSA) Recicla Recicla
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eLK eLK quarto
quarto pulsopulso saida
saida naonao
ao
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<;ao <;ao 1,1, sa sa seseririeses icic sese operacao operacao ri ri trtr os os pupulslseses 'fclock 'fclock 2':2': ~xJ~xJ (7-2)(7-2) onde onde (7-3) (7-3) Por
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los, disparadosdisparados simultaneamen-
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206
206 SistemasSistemas DtgttaisDtgttais P rP r n cn ct pt pt ot o A p lA p l a ca co e so e s
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Cancel Anytime. sincronos sincronos sao: sao: dccadicos dccadicos 62:
62: contadorescontadores sincronossincronos
EXE EXEMPIMPI,O,O 7·17·1 a F a F ns. ns. umum contaclorcontaclor modulo modulo 16.16. para para LIm LIm A,'} A,'} ~-'._.. ~-'._.. Contadores
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20
20 SiSiststememasas DiDigigitataisis PrPrtntnoioipipiosos ApApltltcacacocoeses
CLOCK CLOCK Up/Down Up/Down Up/Down Up/Down CLOCK CLOCK (a) (a)
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C o n t
C o n ta d oa d or er e R e g iR e g is ts tr ar ad o rd o re se s 2020
CLOCK CLOCK
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21
21 SisSistemtemasas DigDigitaitaisis PrtnciptosPrtnciptos AplAplloaloacoccoc pC pC Pu Pu TeTe 74LS193 74LS193 ()---+- ()---+-contador contador crescente/decrescente crescente/decrescente 0, 0, (a) (a) Se
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VR EnEntrtradad ssssfnfncrcronon dede reresese gegerara (a
(atitivava emem ALALTOTO
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(atitivava emem BABAIXIXO)O)
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Saidid dede cocontntagagemem tetermrmininalal dedecrcresescecentnt
TC
TC SaSaidid cocontntagagemem tetermrmininalal crcresescece tete (a
(atitivava emem BABAIXIXO)O)
(b) (b)
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212
212 SistemasSistemas DigitatsDigitats PrPrtntnototplplosos ApApltltcacacococscs
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Cancel Anytime. 74 74LSLS1919 ususanandodo Ne Ne asas 74LS19374LS193 C011- C011-OlOl OlOl erer da da TCTC PL.PL. al al )co)co eses to' to' co co c1c1 clcl oeoe de de C7~)C7~) t1t1 ateate 15'15' EmEm t5t5 Cp,) Cp,) TC TC PI PI cocololocaca Con
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214
214 SiSiststememasas DiDigigitataisis PrPrininclclplplosos ApApllllcacacocoeses
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Cancel Anytime. controlecomum controlecomum PL PL Po Po 3D3D C o n C o n a da do ro re se s R e gR e g s ts t a da do ro re se s 215215 COIll COIll C~C~ para
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Si
Siststememasas DiDigigitataisis PrPrinincfcfpipiosos ApApllllcacacocoeses
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