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Question about Timer & UART?

Nantian Gumo

Program:

void main(void)
{
unsigned char t_f = 0;
TMOD = 0X21;
TH0 = 0XB8; //0XB800 ---> 20ms
TL0 = 0X00;
// TH1 = 0XFD; //0XFD ---> 9600,T1,
// TL1 = TH1;
RCAP2L = 0Xdc; //dc-- 11.0592 9600 b8-- //- 11.0592 4800
RCAP2H = 0Xff;
T2CON = 0X34;

SCON = 0X50;
IE = 0X90;
IP = 0X10;

TR0 = 1;
P0=0xff;

while(1)
{
if (TF0) /***detect TF0*****/
{
TR0 = 0;
TH0 = 0XB8;
TL0 = 0X00;
TR0 = 1;
t_f ++;
} /********/
if (t_f == 50)
{
//for RTC
}
}

}

void Serial(void) interrupt 4 using 1
{
ES = 0;
if (TI) TI = 0;
if (RI)
{
//FOR ReceivING the data
RI = 0;
}
ES = 1;
}


......

In the Main_Loop,detecting T0 's overflow flag TF0.In the other side ,enable the UART 's Interrupt.When running ,UART 's Enable ES will be reset at the moment of T0 overflow,UART can only receive a byte.But the RTC is right.So,i delete detecting TF0 in the main_loop,and enable T0 's Interrupt in stead ,code in following:

void Timer0(void) interrupt 1 using 1
{
ET0 = 0;
TR0 = 0;
TH0 = 0XB8;
TL0 = 0X00;
TR0 = 1;
t_f ++;


ET0 = 1;
}

At this time, UART work well but RTC is wrong.
How can i do for both TIMER and UART working well?

0