U1MODE = 0;                 // clear mode register
U1MODEbits.BRGH = 1;        // use high precision baud generator
U1BRG = 85;                 // (FCY/(4*baud))-1
U1STA = 0;                  // clear status register
U1MODEbits.UARTEN = 1;      // enable the UART RX
IFS0bits.U1RXIF = 0;        // clear the receive flag
...
while(U1STAbits.URXDA == 0);    // wait for data to arrive
c=U1RXREG;          // put data in char c
...
if (U1STAbits.UTXEN ==0)
    U1STAbits.UTXEN = 1;    // enable UART TX
while(U1STAbits.UTXBF == 1);    // if buffer is full, wait
U1TXREG = c;            // send a character