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About printf() function !

HE DINGQIU

HI :
if I use these codes the "printf" don't work:
{
SCON = 0x50;
TMOD |= 0x22; TCON = 0x40; TH1 = 0xFD;
//TI = 1;
printf(" thank you");
}
BUT if I set TI to hight(TI = 1) ,the printf
work fine !

why?

0