Oscillator
testi di canzoni it idropulitrice professionale 150 www laura engel it strumenti chirurgici ivg polar t-31 miazzina palmare fujitsu siemens behead kim sun andrews virginia libri travan tr5 pornio video omnia vacanza affitto como inside jupiter dragostea den tea haiduci gabry ponte el mundo de rastafari raz dwa trzy jassica biel charlotte gallery f leali logorrea traduttore spagnolo microsoft office per xp batajsk peg perego modular system pliko erotc pocket kingdom jvc th-s1 sanyo home theatre de noche en la ciudad piron, armand j. ruocco eric prytz call on me umberto poli minghi mietta software dj black pearl jam la vergine sotto il tetto nicholas e berg nidi darac antivirus panda titanium 2006 kyosho caliber hard disk mini freakys helico sharik sting feat cray david nicoletti serie 7 bmw ups e pdu www tigre it grottammare www nellyville com resultados de comipems hp 1150 valentino azzurro fujifilm finepix f610 decrypter sammichele ba kamsutra toe rings e la notte se ne va nova art explosion goldsmith, oliver programmi per funcard answer epson n1200 il pianeta vivente i mari d erba pereyra sony vgn s4hp volvo 2 3 divani letto ted bundy hp c4844ae pettenati case per hard disk esterno les deux alpes video boulevard of broken dreams ww virginio it poster vendita stampante multifunzione copiatrice pagine bianche avellino consulenza internet marketing tommi v la serenissima normas del imss para proyecto arq moderntalking ospedale vicenza dmc panasonic scarpe da mare e barca dat 40 external tape drive hp immagini rottweiller flinta delta fox la cumbia de los trapos nude fight porno alte prestazioni oktoberfest 2004 monaco gioia e rivoluzione pane e sale looney tunes - back in action nvidia geforce 6600 256mb istituto salvemini sicurezza baby porte dexther sloth spartito di adesso tu gabriella labate rivendite animali provincia di arezzo digital camera sony dsc registratore mini disc portatile fotografie erotiche mellin latte in polvere dafa vicario comunication orologio citizen google nel web locandine porno sexso non aprite quella porta 3 amarsi e l immenso giochi biliardo anitra fac simile di ricorso al garante privacy auto usate catania hotel classic lido di savio spanish speaking countrys ior log di attivazione handel suite n11 tania cagnotto fot scs 200 5 chitarre semiacustiche dreamsonweb net d30 canon ryanair voli aerei al green. gospel according to al green nikon 100w opel corsa 1994 fujifilm z1 orari treni sncf foto attrici nude www escord cz tantrico leccarti tv sony televisori al plasma foto gay x gay www newark com holli marie combs teac mp 200 256 mb vuelve www xplus tv accessori passeggino auto polo anno 2002 canon obiettivi reflex zoom she s so high vitaminic srl manuali acces tecnologie educative mp3 breath easy morbida vanessa agevolazioni per rientro emigrati stripoker jennefer love hewit poppa pc133 256 memoria ram pillola anticoncezionale comandante che guevara mp3 renata vigano www webank it over the raimbow download oakley a frame black nintendo gameboy advance zucconi vittorio hp c6657a acer navigatore concorsi per call center ati 9800 pro 128 mb agp m2o vol5 lg lcd 19 flatron appendici carrelli hp all in one 1610 felicita albano e romina power prima station wagon stampanti c86 crno i zlatno fiori di bach come sceglierli civitanova marche ristorante la staffa monitor per pc pime milano sony lettore dvd divx portatile configurazione wap www samsung hi fi com lollipop you caricatore cd clarion incontrare donna russa michel iett www telemarket it grandpa albergo economico avignone The vast majority of electronic systems operate at some fixed frequency.
Usually the component that fixes that frequency is a crystal made of silicon, sealed in a metal can. (Some very-low-cost devices might use a "resonator" or a resistor and a capacitor to fix the frequency).
The entire circuit that generates the frequency is called an "oscillator". (An oscillator that uses a resistor and a capacitor to fix the frequency is called a "RC oscillator". An oscillator that uses a crystal to fix the frequency is called a "crystal oscillator".)
The oscillator includes, in addition to the frequency-fixing component just mentioned, an amplifier and capacitors.
One can buy an "oscillator" in a metal can. Typically an oscillator can has 4 pins. Inside the can is all the components of the oscillator. One applies DC power on 2 of the pins, and the oscillating signal (the "CLK OUT") appears on another pin. (The remaining pin is unused).
Other times one buys just the crystal in a (2-pin) metal can and attaches the other components to build an oscillator.
In either case, the frequency is printed on the top of the metal can.
Many microcontrollers have 2 pins (typically labeled "XTAL1" and "XTAL2", or "OSC1" and "OSC2", or something similar) that are designed to be directly connected to the 2 pins of a crystal. (Capacitors from those pins to VCC and GND are also part of the recommended circuit). An inverter inside the microcontroller acts as the amplifier, and the crystal and capacitors make up the rest of the oscillator.
In systems with multiple CPUs, it is often simpler, cheaper, and more reliable (avoiding metastability problems) to use a single crystal (rather than a dedicated crystal for each CPU). CPUs (and many other components) often have a single "CLK" pin designed to be connected to the wire used to send that "clock signal" (a fixed frequency) everywhere.
Unfortunately, many people confuse the "clock signal" generated by an oscillator (a simple metronome beat, tone, at constant frequency) with far more complicated "clock system"s that keep track of seconds, minutes, hours, and sometimes days, weeks, months, and years.
