定时器3
//T3定时器
INSCON |=0x40; //
T3CON = 0x04; //00000100 //无溢出, 1/1 TR3=1 系统时钟,T3作IO
TL3 =(65536-50000)%256;// 0x0f; //0x00; //0
TH3 =(65536-50000)/256; // 0x00; //0x00; //251 0xfb
SWTHL = 0x01;
INSCON &=0xBF; //选择bank0的特殊寄存器
IEN1 = 0X50;
EA = 1; //所有定时器总开关
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