Using MPLAB SIM debugger (version 7.43), how can I enter a value for the 
ReadUSART function, or at least trigger the interrupt? The function is 
in a interrupt, see code below: I would like to be able to seen printf 
output to the UART window that is in main().

void rx_handler (void);

unsigned char d;
#pragma code rx_interrupt = 0x8
void rx_int (void)
    {
    _asm goto rx_handler _endasm
    }
#pragma code
#pragma interrupt rx_handler
void rx_handler (void)
    {
    unsigned char c;
        extern unsigned char d;
    /* Get the character received from the USART */
    c = ReadUSART();
    d = c;
    /* Clear the interrupt flag */
    PIR1bits.RCIF = 0;
    }
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