if (g_sleep_timer == 0)
                {
                    // enable key interrupt
                    EA=0;
                    IE=0x1f;
                    IP=0x02;
                    TCON = 0x05;
                    TR0= 1;
                    EA=1;

                    // sleep
                    PCON |= 0x02;
                }

按鍵觸發(fā)中斷, 亮橙燈, 關(guān)外部中斷.
void extenal_int() interrupt 0
{
    Yellow_LED_on();
   
    // Disable Key interrupt
    EA=0; 
    IE=0x0A;
    IP=0x02;
    TR0=1;
    EA=1; 
}