//********** LCM1602寫數據程序****
void L1602_WriteData(unchar tdata)
{
 L1602_Busy ();          //測忙
 L1602_RS = 1;           //指向數據寄存器
 L1602_RW = 0;           //寫操作
 L1602_DB = tdata;
 L1602_E = 0;         //上升沿動作
 _nop_();
 L1602_E = 1;
}