pic18 microcontroller and frequency oscillator configuration

// PIC 18F46K22

#define OSCILLATEUR_INTERNE

#ifdef OSCILLATEUR_INTERNE
//#pragma config FOSC = INTIO67, FCMEN = OFF, PLLCFG=OFF            // CONFIG1H  16Mhz
#pragma config FOSC = INTIO67, FCMEN = OFF, PLLCFG=ON           // CONFIG1H  32Mhz
#else
#pragma config FOSC = HSHP, PLLCFG=OFF, FCMEN=OFF      
//#pragma config PRICLKEN=ON 
#endif    
#pragma config IESO=OFF,PWRTEN=OFF,BOREN=OFF,WDTEN=OFF,CCP2MX=PORTC1        
#pragma config PBADEN=OFF,CCP3MX=PORTE0,T3CMX=PORTC0,P2BMX=PORTC0
#pragma config MCLRE=EXTMCLR,STVREN=OFF,LVP=ON,XINST=OFF,DEBUG=OFF
#pragma config CP0 = OFF, CP1 = OFF, CP2 = OFF, CP3 = OFF            // CONFIG5L
#pragma config CPB = OFF, CPD = OFF                                  // CONFIG5H
#pragma config WRT0 = OFF, WRT1 = OFF, WRT2 = OFF, WRT3 = OFF        // CONFIG6L
#pragma config WRTB = OFF, WRTC = OFF, WRTD = OFF                    // CONFIG6H
#pragma config EBTR0 = OFF, EBTR1 = OFF, EBTR2 = OFF, EBTR3 = OFF    // CONFIG7L
#pragma config EBTRB = OFF                                           // CONFIG7H




void Init_UART1(void)
{
// USART_BRGH_HIGH,6  @ 1MHZ     
// USART_BRGH_HIGH,32 @ 10MHZ 
// USART_BRGH_HIGH,51 @ 16MHZ 
// USART_BRGH_HIGH,25 @ 8MHZ 
// init 19200Bd a 10Mhz avec IT en rx
// init 38400Bd a 20Mhz 
// voir para 18.5 spec sheet DS41159B page 186
/*
#ifdef OSCILLATEUR_INTERNE
OSCCON=0b01110000;  //HFINTOSC – (16 MHz)
//111 = HFINTOSC – (16 MHz)
//110 = HFINTOSC/2 – (8 MHz)
//101 = HFINTOSC/4 – (4 MHz)
//100 = HFINTOSC/8 – (2 MHz)
//011 = HFINTOSC/16 – (1 MHz)(3)
#endif
*/
Open1USART( USART_TX_INT_OFF &
USART_RX_INT_ON &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH,104 );  // FOSC= 8x4=32Mhz  19200bds
}



void main() 
{

i1=0;
i2=0;
Drapeaux.Fill=1;
Drapeaux.Blc=1;
DataReady1 = 0;
DataReady2 = 0;
c1=0;
c2=0;

   Init_Hardware(); 
   SortieRC2=1;  // eteint la led tiree au +5V 
   Led_Rouge=0;
    
 #ifdef OSCILLATEUR_INTERNE  
//  the internal oscillator is set to the default frequency of 1 MHz.
// The Internal Oscillator Frequency Select bits  (IRCF<2:0>)
// select the frequency output of the internal oscillator block  
// pour conserver 19200 bauds à 16Mhz sinon retombe à 1200 bauds
// OSCCON=0b01110000;  //HFINTOSC – (16 MHz)
// OSCCONbits.IRCF2=1; //HFINTOSC – (16 MHz)
// OSCCONbits.IRCF1=1;
// OSCCONbits.IRCF0=1;
OSCCON=0b01100000;  //HFINTOSC – (8 MHz)
//OSCCON=0b01010000;  //HFINTOSC – (4 MHz)
//111 = HFINTOSC – (16 MHz)
//110 = HFINTOSC/2 – (8 MHz)
//101 = HFINTOSC/4 – (4 MHz)
//100 = HFINTOSC/8 – (2 MHz)
//011 = HFINTOSC/16 – (1 MHz)(3)
  OSCTUNE=0;
//  OSCTUNEbits.PLLEN=0;  //  0 =sans PLL => 16Mhz  ou 8, 4, 2, 1Mhz 
  OSCTUNEbits.PLLEN=1;  // 1= avec PLL => 8*4= 32Mhz  
#endif   
   
   Tempo(200000L);
   Led_Rouge=!Led_Rouge;  
  
  OUT_RS232
  c1 = 0;
  DataReady1 = 0;
  buffer[0]=0;
  
  Init_UART1();         // 19200 bds
  RCSTA1bits.CREN = 0 ; // disable reception
  Put_RS(CLS);  
  Tempo(300000);
  txt=&Texte[0];
  strcpypgm2ram(txt,RS_Str[1]);    
  k=PutStr_RS(txt);    
  ...