第1个回答 2012-10-31
SCON = 0x40;
TMOD = 0x23;
PCON = 0x00;
TH1 = 0xfd;
TL1 = 0xfd;
TI = 0;
TR1 = 1;本回答被提问者和网友采纳
第2个回答 2012-10-31
SCON = 0x40;
TMOD = 0x23;
PCON = 0x00;
TH1 = 0xfd;
TL1 = 0xfd;
TI = 0;
TR1 = 1;
第3个回答 2012-10-31
TMOD=0x23;
SCON=0x50;
TH1=0xfd;
TL1=0xfd;
TR1=1;