F_OSC definition for Uart using PIC18f

Question

PIC18f67j11. For F_OSC which one i have to use: My crystall oscillator frequency or the real frequency oscillator including my PLL modifications?

I'm trying to match the baudRate of the UART and doesn't work. i've tried all reg configurations and baudRate formulas but none of them seems to work.

I'm using a 20MHz external crystall (connected in OSC1 and OSC2) with maximum PLL (OSCTUNE.TUN = 01111) xtal for a 4800bit/s to measure energy by the MCP35F501 meter CI.

Here is the clock code selection:

`
#define F_OSC                           20000000 
#define FOSC_PLL                        20000000 * 4  
#define FCY                             F_OSC / 4 
`

`// seleciona clock
    OSCCON  = 0xF0;               // INTOSC = 8MHz; SCS = 00: default primary oscillator
    OSCTUNE = 0b01011111;         // PLL = ON; TUN = 011111: Maximum frequency`

And my UART config:

`
void configureUart(unsigned char uart, unsigned long baudRate) {
` 

    RCSTA2bits.SPEN = 1;
    RCSTA2bits.CREN   = 1;           // Habilita recepção
    TRISGbits.TRISG1 = 0;
    TRISGbits.TRISG2 = 1;
    TXSTA2bits.BRGH = 0;        //Low Speed Mode (baud = 8bits)
    TXSTA2bits.SYNC = 0;        // 0 = Asynchronous Mode
    TXSTA2bits.TX9 = 0;         //Transmissão feita em 8 bits
    RCSTA2bits.RX9 = 0;         //Recepção feita em 8 bit
    BAUDCON2bits.BRG16 = 1;     //16bit Baud Rate Generator 

    TXSTA2bits.TXEN = 1;        // Habilita transmissão
    UART2_RX_INT_EN = 1;        //
    UART2_RX_PRIORITY  = 0;     // Baixa prioridade de interrupção

    baudRate = 1050;//(unsigned long)(FOSC_PLL / (baud_rate * 16)) - 1; TRYING TO MATCH MANUALY TO VALIDATE THE PROTOCOL :#
    // Calcula o novo valor para o registro de configuração do baud-rate
    SPBRGH2 = baudRate >> 8;   // Atualiza BRG da UART1
    SPBRG2 = baudRate;         // ...  
}

`

Answer 1

I'm used the true value of the entrance clock and it's working now. So the value of the FOSC to UART BaudRate calculus is the value of the crystall including the PLL modifications. In resume is the input value of the CPU.