flawed uart for pic. It resets.

uart.c

#define _XTAL_FREQ 4000000
#include <pic16f688.h>
#include <xc.h>

// CONFIG
#pragma config FOSC = INTOSCIO // Oscillator Selection bits (INTOSC oscillator: CLKOUT function on RA4/OSC2/CLKOUT pin, I/O function on RA5/OSC1/CLKIN)
#pragma config WDTE = ON        // Watchdog Timer Enable bit (WDT enabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = ON       // MCLR Pin Function Select bit (MCLR pin function is MCLR)
#pragma config CP = OFF         // Code Protection bit (Program memory code protection is disabled)
#pragma config CPD = OFF        // Data Code Protection bit (Data memory code protection is disabled)
#pragma config BOREN = ON       // Brown Out Detect (BOR enabled)
#pragma config IESO = ON        // Internal External Switchover bit (Internal External Switchover mode is enabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor
//#pragma config CLKOUTEN = OFF

#define STRLEN 12

volatile unsigned char t;
volatile unsigned char rcindex;
volatile unsigned char rcbuf[STRLEN];

void USART_init(void)
{
    TXSTAbits.TXEN = 1;     // enable transmitter
    TXSTAbits.BRGH = 1;     // high baud rate mode
    RCSTAbits.CREN = 1;     // enable continous receiving

    // configure I/O pins
    //ANSELbits.ANSB5 = 0;   // RX input type is digital
    TRISCbits.TRISC4 = 1;     // RX pin is input
    TRISCbits.TRISC5 = 1;     // TX pin is input (automatically configured)

    SPBRG = 25;            // set baud rate to 9600 baud (4MHz/(16*baudrate))-1

    //PIE1bits.RCIE = 1;      // enable USART receive interrupt
    RCSTAbits.SPEN = 1;     // enable USART
}

void USART_putc(unsigned char c)
{
    while (!TXSTAbits.TRMT); // wait until transmit shift register is empty
    TXREG = c;               // write character to TXREG and start transmission
}

void USART_puts(unsigned char *s)
{
    while (*s)
    {
        USART_putc(*s);     // send character pointed to by s
        s++;                // increase pointer location to the next character
    }
}

void main(void)
{
//    OSCCONbits.IRCF = 0x0D; // INTOSC frequency 4MHz

    USART_init();

    USART_puts((unsigned char *)"Init complete!\n");

  //INTCONbits.PEIE = 1;    // enable peripheral interrupts
  //INTCONbits.GIE = 1;     // enable interrupts

    while(1)
    {
        __delay_ms(500);
        USART_puts((unsigned char *)"test\n");
    }

}