CCS/MSP430F4152: MSP430F4152

Tool/software: Code Composer Studio

Hello,

I am stuck with a small issue,

I am not able to find the solution.

I am using MSP430F4152.

IN the micro controller, I am using rx interrupt ( i receive the data from PC to the micro controller),

then I use timer interrupt, 

by timer interrupt, i transmit the data to the PC from Micro controller.

My Program in : 

//unsigned int old;
char old;

#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer_ISR(void)
{  
            putchar(old);
             LPM3_EXIT;
}

#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCIA0RX_ISR (void)
{
    old = UCA0RXBUF;                   
 //   putchar( old);
//    LPM3_EXIT;
}

int main(void)
{
    unsigned int i;

       WDTCTL = WDTPW | WDTHOLD;	// stop watchdog timer
	
//----------------------------------------------------------
	      FLL_CTL0 |= XCAP11PF;                     // Configure load caps

               BTCTL = (BTIP2+BTIP0);                    //2 msec
	       IE2 |= BTIE;

         
              LCD_init();
	      uart_init();

while(1)
	      {

	          LCD[0] = digit[1];

//*/================================================
        
	          __bis_SR_register(LPM3_bits+GIE);
	       }
//	return 0;
}


PROBLEM :
 I WANT TO RECEIVE 52 (any 2 digit value) ,
 FROM PC TO MICRO CONTROLLER , 
 AND SEND THE VALUE TO PC via TRANSMIT FUNCTION.
1) AFTER RECEIVING DATA, IF I TRANSMIT IN rx interrupt : THE ACTUAL VALUE IS TRANSMITTING (EX : 52),
2) BUT IF I RECEIVE DATA BY rx interrupt,  AND TRANSMIT BY USING TIMER INTERRUPT : ONLY ONE DIGIT IS TRANSMITTING ( EX : I RECEIVE 52, BUT TRANSMIT ONLY '2')
       ( THIS DO NOT HAPPEN IN SINGLE DIGIT VALUE : THE VALUE I RECEIVE.....IS TRANSMITTED EXACT VALUE)


i WANT TO USE BOTH "rx interrupt AND timer interrupts ".
( I have used "int" type also)

CAN YOU PLEASE TELL ME, HOW TO SOLVE IT.

THANKS ,

Srijit.