title: PIC18F OSCCON Register Requied if I define OSC = INTIO1?
body: <p>New to microcontrollers, need to wrap my head around this basic thing:</p>
  
  <p>So, I'm trying to program a PIC18F4520, I know I can set an external clock using <code>#define OSC = HS</code> and connecting the crystal between the required pins. I have a doubt that is, if I define the Oscillator requirement as <code>#define OSC = INTIO2</code>
  BaSically this:</p>
  
  <pre><code>#include &lt;xc.h&gt;
  
  #pragma config OSC=INTIO1                //HERE!!
  #pragma config PWRT=OFF
  #pragma config WDT=OFF
  #pragma config DEBUG=OFF, LVP=OFF
  
  void delay(int);
  
  void main(void) {
  
  return;
  }
  </code></pre>
  
  <p>Do I need to set the OSCCON register and the CONFIG1 register?</p>