很简单的问题请看一下
HITGB 2003-10-15 03:26:29 SCON = 0xD0; /* SCON: mode 3 */
PCON = 0X80; /* SMOD = 1 */
TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload; */
TH1 = 0X0FD; /* TH1: reload value for 1200 baud @ 16MHz*/ TL1 = 0X0FD; //fd-19200 fe-28800
TR1 = 1; /* TR1: timer 1 run */
TI = 1; /* TI: set TI to send first char of UART*/
这里TI=1是什么意思